A small form factor PC case is a desktop chassis built around a Mini-ITX or Mini-DTX motherboard that usually holds between 4 and 20 litres of internal volume. It trades full-size ATX expansion for a much smaller footprint, but it still accepts modern multi-slot graphics cards as long as you check the maximum GPU length before you buy.
That compatibility check is the whole game. The same Mini-ITX board fits ten very different boxes, and the difference between a good SFF build and a frustrating one is usually a single number on a spec sheet. We went through the specs and owner feedback on every current Mini-ITX case we could find, then lined up the four numbers that decide whether a build works: case volume, maximum GPU length, power supply format and CPU cooler clearance.
Updated for 2026. These picks cover genuine pocket SFF at 4.3 litres through to roomy 18.9 litre chassis, and every one of them is a real product with owner feedback behind it. If you are still working out the rest of your parts list, our gaming headset roundup covers the audio side, and our PC speaker picks are worth a look for a desk setup where every centimetre counts.
Table of Contents
Top 3 Picks for Small Form Factor Builds (September 2026)
Fractal Design Terra Jade
- 10.4 L volume
- 322 mm GPU clearance
- Walnut front panel
- PCIe 4.0 riser
All 10 Cases at a Glance in 2026
| Product | Specifications | Action |
|---|---|---|
| Fractal Design Terra Jade |
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 Cooler Master NR200 |
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| KXRORS S300 |
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 SilverStone SG13B |
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 SGPC K39 |
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 Fractal Design Mood |
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 Jonsbo TK-0 |
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 SilverStone SUGO 16 |
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 JOYJOM 4.3 L Case |
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 Thermaltake TR100 |
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Check Latest Price |
1. Fractal Design Terra Jade – Best Overall SFF Case
Fractal Design Terra Jade – Wood Walnut Front Panel – Small Form Factor – Mini ITX Gaming case – PCIe 4.0 Riser Cable – USB Type-C – Anodized Aluminum Panels
10.4 L volume
322 mm max GPU
Walnut and aluminium
2-year warranty
Pros
- Premium walnut front panel and anodised aluminium body
- 322 mm GPU clearance in only 10.4 litres
- 30 mm of stepless internal adjustment
- USB-C 20Gbps front port
- Two-year manufacturer warranty
Cons
- Compact volume limits cooling and storage choices
- Premium materials push it above the entry tier
The Terra is the case I keep coming back to, and the numbers explain why. It gives you 322 mm of GPU clearance inside 10.4 litres, which is a combination most competitors cannot match without pushing past 12 litres. With 715 owner ratings averaging 4.6 out of 5, it is also the most thoroughly reviewed case in this group, and that is worth something in a category where most chassis are still collecting their first hundred reviews.
Build quality is the standout. The front panel is cut from FSC-certified solid walnut, the body is anodised aluminium, and the front panel itself is 8 mm thick. It is one of very few SFF cases that looks considered from across a room rather than like a folded sheet of metal with a fan bolted to it.
The layout is the clever part. A stepless, slidable central wall gives you 30 mm of internal flexibility, so you can shift the spine to trade space between the graphics card and the storage cage. That is how a chassis this small still fits both a long card and your drives. The front I/O is a machined aluminium power button, one USB-A and one USB-C at 20Gbps, which is the fastest front Type-C implementation in this roundup.
Cooling is a 12 cm fan size and the case is designed around low-profile coolers such as the Noctua NH-L12S and Fractal Aspect 120 mm units. Storage is limited to two internal bays, so plan your drive layout before the first screw goes in.
Who the Terra suits
This is the pick for a builder who wants one case that handles a long, thick graphics card and still looks good on a shelf. If you are moving from a mid-tower and want a real size reduction without giving up card clearance, the Terra is the least dramatic compromise on the list.
It also suits anyone with a modern high-end GPU. At 322 mm of clearance it takes cards that other 10 litre designs cannot, which is the single most common compatibility failure we found across these products.
What to watch out for
At 10.4 litres, the cooling options are narrower than the exterior suggests. There is no room for a 240 mm radiator, and CPU coolers have to be genuinely low-profile. If you plan to overclock or run a high-wattage chip under sustained load, the volume works against you.
The materials are also a cost decision. Owners rate the fit and finish highly, but the same group notes that the tight volume limits cooling and storage options. Buy it for the build quality, not for the litre count, because there are smaller boxes.
2. Cooler Master NR200 – Best for First-Time SFF Builders
Cooler Master MasterBox NR200 Mini ITX Computer Case – Compact SGCC Steel Chassis, Tool-Free 360 Degree Accessibility – NR200 Black
330 mm max GPU
240 mm radiator
Mini-DTX support
2 fans included
Pros
- Tool-free 360 degree panel access
- 330 mm GPU and 240 mm radiator room
- 4.8 rating across 309 reviews
- Two fans already installed
- Mini-DTX boards up to 244 x 226 mm
Cons
- Footprint is large next to sub-10L designs
- Top AIO placement can clash with some board fan headers
- Limited PSU mounting makes cable routing tight
The NR200 is the case forums keep calling the safe default for anyone moving into Mini-ITX, and the 4.8 rating across 309 reviews backs that up. Roughly 83 percent of those ratings sit at five stars. It is not the smallest option here, and it is not trying to be, which is exactly why it works for a first build.
Everything is designed around assembly. Panels come off with quick-access pins, giving you 360 degree access to the frame without tools, and roughly 90 percent of the chassis uses a single screw type. A 120 mm top fan and a 92 mm rear fan are already installed, so the only cooling decisions you face are optional additions.
On paper it is generous for a 14.8 by 7.28 by 11.5 inch footprint. Graphics cards up to 330 mm, CPU coolers up to 155 mm, and SFX or SFX-L power supplies up to 130 mm. Radiators fit up to 240 mm on the side and 140 mm at the front bottom, with room for up to seven fans in total. It also accepts Mini-DTX boards up to 244 x 226 mm when the PSU mounts at the front.
Who the NR200 suits
Pick this if it is your first compact build and you would rather not spend a Saturday fighting a screwdriver. The tool-free access and single screw type remove most of the friction that makes small cases punishing.
It is also the right call if you want cooling headroom. A 155 mm CPU cooler and a 240 mm radiator in an ITX case is a lot of thermal headroom, and enthusiast communities regularly point to the NR200 when someone asks for an ITX chassis that does not force liquid cooling on you.
What to watch out for
The footprint is the trade-off. Next to a 5 litre or 8 litre case, 14.8 inches deep is not a dramatic size reduction, and owners cite the larger size versus true sub-10L designs as the main reason to look elsewhere.
Two smaller issues do come up. A top-mounted AIO can conflict with the fan headers on some motherboards, and the single PSU mounting position makes cable routing tighter than ideal. Neither is a dealbreaker, but both are worth knowing before you start.
3. KXRORS S300 – Most Compact Under 10 Litres
S300 – Gaming Case – Front I/O USB 3.0 Type – C Port – SFX Power Supply 100-130mm -Cable Management System – luminum Mini-ITX Motherboard Small Portable for PC (PCIe 3.0 16X Riser Cable)
8.1 L volume
305 mm max GPU
60 mm cooler limit
Gen 3 riser included
Pros
- Genuinely compact 8.1 L metal chassis
- Three-sided mesh moves a lot of air
- PCIe 3.0 riser cable in the box
- Front USB-C
- 4.5 rating across 325 reviews
Cons
- 60 mm cooler limit rules out all AIO radiators
- Dense CPU-side mesh runs hotter and louder
- Printed instructions are minimal
The S300 is the value pick of the whole roundup. It gives you 8.1 litres of all-metal, powder-coated chassis at 2 kg, with 305 mm of GPU clearance, and the riser cable is already in the box along with a magnetic dust filter, screws and cable ties. For 325 ratings averaging 4.5, that combination is hard to argue with.
The reason it stands out against other 8 litre designs is the graphics card envelope. It takes cards up to 305 mm long, 130 mm wide and 55 mm tall at 2.5 slots. That covers a lot of mid-range gaming cards that the 185 mm design in this roundup simply cannot accept.
Cooling is where the compromise lives. CPU cooler height is capped at 60 mm, which rules out every AIO radiator and every tower cooler worth the name. The case ships with 6 cm fans and three-sided mesh panels that do a good job of moving air for the size.
Power supply support covers 100 mm to 130 mm SFX and SFX-L units. The motherboard platform is a standard 170 x 170 mm Mini-ITX board.
Who the S300 suits
This is the case for a desk footprint problem rather than a hobby. If you need a real gaming-capable machine in a small space, want a card longer than most competitors allow, and do not plan to run a hot CPU, it does a lot for very little.
It is also a good first SFF build for someone comfortable following a video. Owners widely describe the value as the standout, and the accessory bundle means you are not immediately ordering a screwdriver and a riser cable.
What to watch out for
The 60 mm cooler ceiling is the number to remember. Reported thermals on gaming loads typically land between 58 and 73 C depending on the CPU, with 65 C or lower processors running cooler. If you already own a tower cooler, it will not go in here.
The riser is a PCIe 3.0 unit, which means you must set the motherboard BIOS PCIe speed to GEN3 or the system will not boot. The dense CPU-side mesh also pushes noise up on high-TDP chips, and the printed instructions are thin enough that most owners work from online build videos instead.
4. SilverStone SG13B – Best Proven Budget Case
SilverStone Technology Ultra Compact Mini-ITX Computer Case with Mesh Front Panel Black (SST-SG13B-USA)
11.5 L volume
10.5 inch card support
Full ATX PSU
Air or 120/140 mm AIO
Pros
- 536 owner ratings averaging 4.6
- Accepts full ATX power supplies
- 10.5 inch expansion card support
- Air or 120 and 140 mm AIO cooling
- Supports 2.5 and 3.5 inch drives
Cons
- Utilitarian styling next to fabric and wood cases
- Larger than sub-10L cases with the same board support
The SG13B is one of the longest-running designs here, with 536 ratings holding a 4.6 average and 76 percent at five stars. In a category where most cases are still working through their first hundred reviews, that track record is the main argument for it.
It is also unusually accommodating for a compact chassis. Standard-length 10.5 inch expansion cards fit, and so does a full ATX power supply, which removes the single most common SFF parts problem: hunting for an SFX unit in a form factor that is harder to cool. Both 2.5 inch and 3.5 inch drives are supported.
Cooling is flexible. The mesh front panel supports air cooling or a 120 mm or 140 mm single-fan all-in-one liquid cooler, and the listing notes three fans supported at the front. The chassis measures 8.47 by 7.13 by 11.22 inches for 11.5 litres, at 5.4 pounds.
Motherboard support covers Mini-DTX and Mini-ITX, so you are not locked to a 170 mm board if you want a slightly larger one. The case type is listed as a mini-tower, and that is accurate: this is a small tower, not a sandwich design.
Warranty is one year parts and labour, which is the shortest in this roundup apart from the S300.
Who the SG13B suits
Buy this if you already own an ATX power supply and a full-length graphics card and you just need a small box to put them in. Those two compatibility wins remove most of the planning that a compact build normally demands.
It is also the safe recommendation for a family or office machine. With 3.5 inch drive support, simple assembly and a long owner history, it is a low-risk first SFF purchase.
What to watch out for
The look is functional. Owners note older, more utilitarian styling compared with newer fabric or wood-accented designs, and that is fair: this will not be the case that gets photographed.
At 11.5 litres it is also larger than several sub-10L competitors carrying the same board support. If desk depth is the actual problem, measure before you commit.
5. SGPC K39 – Best 5 Litre Case for Travel
SGPC K39 5L Mini ITX Case,Portable SFF Gaming Chassis,White Standard Edition
5.1 L volume
185 mm max GPU
Flex-1U PSU
4.1 pounds
Pros
- True 5.1 litre steel chassis that fits a backpack
- 1.5 mm steel with ventilated side panels
- Screws and a magnetised screwdriver included
- Two carry handles
- USB 3.2 and Type-C front I/O
Cons
- Advanced build rated above novice level
- Riser cable is sometimes sold separately
- Flex-1U power supplies cost more to source
The K39 is the smallest case on this list that still runs a discrete graphics card, and at 8 by 3 by 9 inches and 4.1 pounds it is a genuine backpack build. Owners describe the K39 as a budget alternative to the well-known 5-litre enthusiast cases, and 68 percent of its 91 ratings sit at five stars.
Construction is 1.5 mm steel with ventilated side panels on one side and acrylic on the other, plus a dust filter. Storage is two 2.5 inch bays with anti-vibration mounts, and the front I/O covers USB 3.2 and Type-C. Two carry handles are included, which sounds minor until you are moving the machine between rooms.
The layout is a Flex-1U power supply design with Mini-ITX motherboards at 170 x 170 mm. Graphics cards up to 185 mm long and 43 mm thick fit with a compatible dual reverse riser cable. That is a low-profile card envelope, not a mid-range gaming one.
The case supports both horizontal and vertical placement, and the removable panels open the whole side for assembly. Accessories in the box include screws, a magnetised screwdriver and an acrylic side panel.
Owners report it performing adequately for gaming, HTPC and office use, which is a fair summary of where a 185 mm GPU limit lands you.
Who the K39 suits
Pick this for a portable system you carry to LAN events, or a living-room HTPC-style box you want to move between the desk and the shelf. At 5.1 litres it is one of the few small form factor cases on this list that genuinely travels.
It is also a good second SFF build for someone who has done a full tower before and enjoys the puzzle. Low-profile cards such as an RTX 4060 class part are the realistic pairing.
What to watch out for
The builder notice is unambiguous: this is an advanced case, it needs a riser cable for a discrete GPU unless the bundle includes one, and it is not recommended for novices. Check what is in the box before you order a power supply.
Flex-1U power supplies are harder and more expensive to source in some regions, and a handful of owners report minor panel misalignment, bendable panels and rubber feet that detach in transit. All of that is fixable; none of it is invisible.
6. Fractal Design Mood – Best Looking Case for a Living Room
Fractal Design Mood Light Gray PC Case – Sleek Fabric Design, 180mm Top Fan, Conceals 325mm Graphics Card, m-ITX Motherboard Compatible, Easy Access Build, Efficient Cooling
325 mm max GPU
280 mm radiator
114 mm cooler
PCIe 4.0 riser
Pros
- Fabric-wrapped shell blends into furniture
- Large 180 mm top fan included
- 325 mm GPU and 280 mm radiator room
- PCIe 4.0 riser included
- Shell slides off for full access
Cons
- Fabric front runs CPU and NVMe temperatures high
- All I/O on the underside means tipping the case over
- Three-slot graphics cards are not supported
The Mood is the only fabric-wrapped case here, and that single design decision changes where it belongs: a sofa, a shelf or a desk in a living room rather than a glass-and-aluminium gaming tower. Owners overwhelmingly buy it for how it looks and then find the quiet 180 mm top fan a bonus.
The hardware underneath is more serious than the fabric suggests. Graphics cards up to 325 mm, a PCIe 4.0 riser cable in the box, CPU air coolers up to 114 mm and radiators up to 280 mm, which only the TR100 in this roundup matches. The 325 mm card clearance also covers modern high-end GPUs.
The fabric enclosure slides off to give full access for building, and there is a built-in fan plus a dust filter. At 4.6 kg it is a substantial object rather than a lightweight one, which helps it feel stable in a living-room setting.
Port placement is unusual: every I/O port sits on the underside of the chassis. That looks clean from above and means you tip the case over for any cable change.
Who the Mood suits
This is the case for someone whose PC lives in a living room and cannot look like a gaming PC. The dedicated mesh panel behind the graphics card also produces excellent GPU temperatures, which owners single out repeatedly.
It suits a build with a long card and a 240 mm or 280 mm radiator where appearance matters as much as fit. At 4.3 across 125 ratings it is well reviewed, if not universally rated.
What to watch out for
Thermals are the tradeoff. The fabric front is restrictive, and owners report CPU and NVMe temperatures running high enough to need a down-blower cooler or undervolting. This is the one pick here where the enthusiast answer is to tune the software, not the hardware.
Three-slot graphics cards are not supported, and loose fabric alignment is reported on some units, along with sun-faded fabric on the black version over time. Cable management is tight for a living-room-style layout.
7. Jonsbo TK-0 – Best Display Case for a Showcase Build
JONSBO TK-0 Black ITX Mini Tower PC Case, Hyperboloid Glass Desktop Design,Separated Cabinet Structure, Al Alloy Shell DTX/ITX Walnut Wood Computer Case, Sff Case,Black
Dual-curved glass
230 mm max GPU
137 mm cooler
2-year warranty
Pros
- Distinctive dual-curved tempered glass with walnut veneer
- Works in horizontal and vertical orientation
- Dual-chamber layout simplifies cable management
- Removable PCI cover for easy GPU swaps
- 137 mm CPU cooler height
Cons
- 230 mm GPU limit excludes larger high-end cards
- Storage limited to one 3.5 inch HDD and one 2.5 inch SSD
- Aluminium and veneer shell leaves less internal room
The TK-0 is built to be looked at. A 270-degree dual-curved tempered glass panel wraps the front, backed by 16 mm wood veneer and an aluminium alloy and steel shell, and it works equally well lying flat or standing up. At 55 ratings with 83 percent at five stars, the visual appeal is landing with buyers.
Inside is a dual-chamber structure that separates hardware from cables, which is why owners report easier cable and hardware management than the exterior suggests. A removable aluminium PCI cover lets you pull the graphics card out without dismantling the case.
Hardware support covers an ITX motherboard, a 160 mm SFX power supply, a 230 mm graphics card, one 3.5 inch hard drive and one 2.5 inch SSD. Cooling takes CPU coolers up to 137 mm, with 120 mm mounts at the top and bottom and two optional 90 mm rear fans.
The dimensions are 235 mm wide by 250 mm deep by 280 mm high, or 9.3 by 9.8 by 11.2 inches, foot height included. The warranty is two years from the manufacturer.
Two internal bays are listed, matching the drive support in practice.
Who the TK-0 suits
Pick this for a build where the hardware is meant to be visible, and where you will change graphics cards occasionally. The removable PCI cover and dual-chamber layout suit a hobbyist who enjoys the build as much as the finished machine.
It also suits a desk where orientation matters. Whether it sits flat or upright changes the whole footprint, and very few cases this size give you the choice.
What to watch out for
The 230 mm graphics card limit is the important one. It rules out the longest modern high-end cards, so measure yours before you commit, and it is the main reason this case sits below the Terra and the TR100 for practical builds.
Storage is thin at one 3.5 inch drive and one 2.5 inch SSD. The aluminium alloy and veneer shell also leaves less usable internal room than a steel tower of the same external size.
8. SilverStone SUGO 16 – Best for Full ATX Power Supplies
Silverstone Technology SUGO 16 Black Mini-ITX Small Form Factor case with All Steel Construction, SST-SG16B
16 L all-steel chassis
275 mm max GPU
ATX PSU
120 mm AIO
Pros
- Rigid all-steel construction
- Accepts 275 mm cards and full ATX power supplies
- Motherboard backplate cutout for easier CPU cooler fitting
- 120 mm AIO radiator support
- 4.8 rating with no one or two-star reviews
Cons
- Only one year limited warranty
- Conventional mini-tower styling
- Single expansion slot limits multi-GPU use
The SUGO 16 shares the top rating in this roundup at 4.8 across 54 ratings, and unlike some cases in the category it has no one or two-star feedback at all. Owners describe it as a rigid, straightforward all-steel Mini-ITX chassis, and the sample is small enough that the rating deserves some context.
The reason to shortlist it is simple compatibility. It takes standard-length graphics and expansion cards up to 275 mm, full ATX power supplies, and Mini-DTX or Mini-ITX motherboards. ATX power supply support in a 16 litre chassis is unusual, and it means you can reuse a supply you already own.
Cooling covers a 120 mm all-in-one liquid radiator, and there is a CPU cooler opening on the motherboard backplate for convenient assembly and later upgrades. Front I/O gives you two USB 3.0 ports and a combo audio jack. One 12 cm fan is listed.
The case measures 11.02 by 7.87 by 9.13 inches in an all-steel mini-tower body with the power supply mounted at the bottom. It is a conventional small tower rather than a sandwich or vertical design. Two internal bays are listed for 2.5 inch drives, and the warranty is one year limited.
Who the SUGO 16 suits
Buy this if you want the compact footprint without the SFX power supply hunt. Reusing an ATX supply with proper modular cables removes both the sourcing problem and the higher cost that goes with it.
It is also a sensible compact workstation or gaming box where the build will be touched occasionally rather than constantly. The backplate cutout saves real time on the first assembly.
What to watch out for
At 16 litres this is a mini-tower, not a pocket SFF case, so the desk saving is modest. If the goal is to go from a mid-tower to something dramatically smaller, this will not deliver that.
The styling is basic and there is a single low-profile expansion slot, so multi-GPU configurations are out. The one-year warranty is also the shortest coverage on any steel case here.
9. JOYJOM 4.3 L Mini ITX Case – Smallest Footprint Here
Aluminum Mini ITX Case with PCIe 3.0 Riser, JOYJOM Mini PC Case, SFF Small Form Factor PC Case, TX Computer Gaming Case Supports GPU Graphics Card (Black)
4.3 L volume
36 mm cooler limit
Flex-Small 1U PSU
1.14 kg
Pros
- Smallest footprint in the roundup at 4.3 L
- 2.0 mm aluminium body with good heat dissipation
- Light at 1.14 kg for real portability
- PCIe 3.0 riser included in the box
Cons
- 36 mm cooler limit rules out all tower coolers and AIOs
- Graphics card limited to 17 x 10 x 4 cm
- Requires a Flex-Small 1U power supply
At 4.3 litres and 1.14 kg, this is the smallest and lightest chassis in the roundup, and it is the one with the most constrained parts list. The 4.1 rating across 115 reviews is the lowest here, and the 13 percent three-star and 6 percent one-star share tells you exactly why: the case is unforgiving about what you put in it.
The body is 2.0 mm aluminium alloy, which is a sensible material choice at this size because it moves heat better than thin steel. Dimensions are 18.4 by 10.4 by 22.3 cm, or 7.3 by 4.1 by 8.8 inches. A PCIe 3.0 riser cable measuring 18.5 cm is included, and the box contains the case, riser and screws.
Compatibility is the whole story. Motherboards must be a standard 17 by 17 cm ITX board, the power supply is a Flex-Small 1U unit at 15 by 4 by 8 cm, graphics cards must fit 17 by 10 by 4 cm, storage is two 2.5 inch SSDs under 9 mm thick, and the CPU cooler must be under 36 mm.
One front USB port is listed. For a chassis this size that is a realistic number, but plan your peripherals around it.
Owners who match low-power components to the chassis like the footprint, the light weight and the included riser. The rating reflects the mismatch that happens when people buy a compact case for a full-size build.
Who this case suits
This is for a genuinely portable small system, an HTPC or a travel rig where low-power components are the goal rather than a compromise. At 1.14 kg it is the only chassis here you can comfortably carry in one hand with a full build inside.
It also suits a first SFF project on a strict budget where you are deliberately using a low-wattage CPU with integrated graphics or a minimal card.
What to watch out for
The 36 mm CPU cooler limit rules out every standard tower cooler and every AIO radiator on the market. There is no water cooling path here at all, which makes the case entirely dependent on your CPU choice.
The graphics card envelope of 17 by 10 by 4 cm excludes most modern dual- and triple-fan cards, and the required Flex-Small 1U power supply is a costly extra purchase. There is also only one 2.5 inch SSD bay per side and no 3.5 inch drive support. If you have to buy a specialised power supply, most of the saving has already gone.
10. Thermaltake TR100 – Best Roominess for Large Graphics Cards
Thermaltake TR100 SFF Chassis; mITX Support; 18.9 Liters; PCIe 4.0 Riser Cable Included; 360mm GPU Clearance; 280mm Radiator Support; Removable PCIe Bracket; Future Dusk; CA-11A-00SNNN-00
18.9 L volume
360 mm max GPU
280 mm radiator
3-year warranty
Pros
- 360 mm GPU clearance covers the longest modern cards
- 280 mm radiator and dual-chamber layout
- PCIe 4.0 riser cable included
- Removable PCIe bracket plus GPU brace
- Longest warranty here at three years
Cons
- 18.9 litres is large next to sub-10L designs
- 68 mm cooler limit rules out most tower coolers
- No 360 mm AIO support
The TR100 is the opposite approach to the cases at the start of this list: 18.9 litres of dual-chamber design, built so you can stop worrying about fit. Its 360 mm graphics card clearance is the longest of any case here, and it comfortably takes a 280 mm radiator.
It ships with a PCIe 4.0 riser cable, which removes the bandwidth question entirely and avoids the BIOS change some Gen 3 risers demand. The removable PCIe bracket plus an integrated GPU brace simplify installation and stop the card sagging in a layout where it is mounted away from the rear slots.
Power supply support covers SFX and SFX-L. CPU cooler clearance is 68 mm, which is a genuine constraint and the one number to check before you commit. A dust filter and a portable-oriented layout round out the package, and the manufacturer warranty runs three years, the longest in this roundup.
With 99 ratings at a 4.6 average and 80 percent five-star, the feedback is consistently positive about room and features, with the 68 mm cooler limit and 280 mm radiator ceiling as the stated offsets. A range of colourways is produced.
Storage is listed at one internal bay, so plan around a single drive or an external solution.
Who the TR100 suits
Pick this if you want the full range of SFF options rather than the smallest possible box. It suits a high-wattage gaming build with a long card, a 280 mm AIO and a three-year warranty that outlasts most of the competition.
It is a good match for someone who likes SFF aesthetics but not the component restrictions, and for a case you may add parts to over several years.
What to watch out for
At 18.9 litres the desk saving is limited compared with true sub-10L designs. If your problem is shelf depth rather than clutter, this does not solve it.
The 68 mm CPU cooler height rules out most tower air coolers, and 360 mm AIOs will not fit, so your water cooling options stop at 280 mm. One internal bay is also a real constraint for anyone planning a multi-drive machine.
How to Choose a Small Form Factor PC Case
What counts as small form factor
There is no official cut-off, but the working range is 4 to 20 litres of internal volume with a Mini-ITX board at the centre. Below about 6 litres you are into genuinely portable territory where most modern gaming cards will not fit. Between 8 and 12 litres you get real component flexibility. Above 15 litres you are looking at a compact tower, which is still small form factor by footprint but no longer by volume.
Measure the footprint as well as the volume. A 12 litre case can be taller and narrower than a 10 litre one, and it is the outside dimensions that decide whether it fits on your desk or shelf.
Sandwich, vertical or compact tower layout
A sandwich layout stacks the graphics card above or beside the motherboard, which is what makes cases like the S300 and the JOYJOM so small. It usually requires a riser cable and it puts more heat into a tiny volume, so many builders add liquid cooling.
A vertical layout puts the motherboard on one side and the card on the other, standing upright. You get better airflow and easier air cooling, and the case becomes a natural display object, which is how the Jonsbo TK-0 and Fractal Mood work. A compact tower is the simplest of the three and needs no riser at all, which is the appeal of the SilverStone cases here.
Measure your GPU before you buy
This is the most repeated question on SFF forums and the easiest way to avoid a dead end: measure the length, height and slot width of the graphics card you already own, then shop for a case that clears it with a few millimetres to spare. The clearance numbers in this roundup run from 170 mm on the smallest chassis to 360 mm on the largest.
Watch the slot width as well as the length. The Mood does not take three-slot cards at all, and the S300 caps out at 2.5 slots. Modern multi-fan cards are often 2.5 or 3 slots, so a case that quotes only length may still not accept your card.
PSU: SFX, SFX-L or full ATX
Power supply format is the second most common build blocker. SFX units are the SFF standard and are widely available, SFX-L units are slightly longer and more common in larger compact cases, and full ATX supplies only fit in a few chassis here. The SilverStone SG13B and SUGO 16 both take ATX, which means you can reuse a supply from an older build.
At the very small end, Flex-1U and Flex-Small 1U supplies are a different category again, harder and more expensive to source in some regions. If you are looking at the K39 or the JOYJOM, factor that supply into the parts list first.
Riser cable generation explained
A PCIe riser routes the graphics card to a slot away from the motherboard, and the generation matters. PCIe 3.0 risers are fine for most cards, but some require the motherboard BIOS PCIe speed to be set to GEN3 or the system will not boot. The S300 makes this explicit, and its included riser is a PCIe 3.0 unit.
PCIe 4.0 risers avoid the question entirely and are included with the Terra, the Mood and the TR100. If you are running a current high-end card and want no BIOS tinkering, buying the case with a Gen 4 riser in the box is the simpler path.
Cooling and noise in a small chassis
Small volumes have less metal and less air to move heat through, so airflow design matters more than raw volume. Mesh panels win here: the S300 uses three-sided mesh, and the SG13B and SUGO 16 both use mesh or open fronts. The Mood is the counter-example, where the fabric front pushes CPU and NVMe temperatures high enough that owners undervolt.
On noise, enthusiast communities tend to rate long-term ownership experience over benchmark charts, and the pattern is consistent: a low-profile cooler with a decent fan curve in a mesh case runs quieter than a small high-RPM fan fighting a restricted panel. If you already know your CPU, match the cooler limit before you pick the chassis.
Frequently Asked Questions
What are the best small form factor PC cases?
The Fractal Design Terra Jade is our top pick, pairing 10.4 litres of volume with 322 mm of GPU clearance and a 30 mm adjustable internal spine. Below 10 litres, the KXRORS S300 gives you 8.1 litres and 305 mm of card clearance, while the SilverStone SG13B and SUGO 16 suit builds that want full ATX power supplies and standard-length cards.
What are the best Mini-ITX cases?
For a first Mini-ITX build the Cooler Master NR200 is the easiest, with tool-free 360 degree panel access, 330 mm of GPU clearance and 240 mm radiator support. For the smallest working build, the SGPC K39 at 5.1 litres suits portable and HTPC use with a low-profile card. The Fractal Design Terra is the pick when build quality and card clearance matter most.
What is the best Mini-ITX case that fits a full-size GPU?
Measure the card first, then shop by clearance. The Thermaltake TR100 accepts cards up to 360 mm and the Cooler Master NR200 up to 330 mm, while the Fractal Design Terra takes 322 mm and the Mood 325 mm. Also check slot width, since the Fractal Design Mood does not support three-slot graphics cards.
Which Mini-ITX case has the best airflow?
Cases with mesh or open panels move the most air. The KXRORS S300 uses three-sided mesh panels, and the SilverStone SG13B and SUGO 16 use mesh or open fronts with fan mounts. The Fractal Design Mood is the opposite: its fabric front is restrictive and owners report it running CPU and NVMe temperatures higher than mesh designs.
Are small form factor PCs worth it?
They are worth it when desk or shelf space is the real constraint, and when you want a system you can move. The trade-offs are component limits, tighter cable routing and a longer assembly. Cases like the NR200, SG13B and SUGO 16 reduce those costs by accepting standard ATX power supplies and low-profile CPU coolers.
What is the best power supply for a Mini-ITX case?
Most SFF cases take SFX or SFX-L power supplies, and those are the easiest to find in that form. The SilverStone SG13B and SUGO 16 also accept full ATX supplies, which lets you reuse one from an existing build. The smallest cases, such as the SGPC K39 and JOYJOM, need Flex-1U or Flex-Small 1U units instead, which are harder to source.
Which Small Form Factor Case Should You Buy in 2026?
The Fractal Design Terra Jade is the best of these PC cases for small form factor builds, and the margin is not close. Nothing else here pairs premium aluminium and walnut materials with 322 mm of GPU clearance in 10.4 litres, and its 715 owner ratings are the largest review base in the group, with a two-year warranty behind it.
Match the case to the constraint instead. Buy the Cooler Master NR200 if you are building your first Mini-ITX system and want the least assembly friction. Buy the KXRORS S300 if you need to get under 10 litres without giving up a modern graphics card. Buy the SilverStone SG13B or SUGO 16 if you already own an ATX power supply and want to reuse it. Buy the Thermaltake TR100 if you want the longest card and radiator support available in a compact box.
For appearance rather than fit, the Fractal Design Mood and the Jonsbo TK-0 are the two worth looking at, and both have real compromises around thermals or card length. For genuine portability, the SGPC K39 at 5.1 litres is the practical floor, and the JOYJOM at 4.3 litres only makes sense if you are deliberately running low-power parts.
Whichever one you choose, measure your graphics card, confirm the power supply format and check the CPU cooler limit before you order parts. Those three numbers decide whether the build is a weekend project or a month of troubleshooting. For the wider setup, our PC speaker picks and cello case guide cover the rest of the desk.