8 Best Small Form Factor Cases (October 2026) Top Picks

Building a compact PC used to mean choosing between performance and desk space. That trade-off is mostly gone in 2026, and the best small form factor cases now swallow full-size graphics cards, tall air coolers, and ATX power supplies into enclosures that fit beside a monitor. Our team spent several months assembling, testing, and living with compact chassis to see which ones actually deliver on that promise.

This guide covers eight cases we would happily recommend to a friend. Some are true mini-ITX towers under 12 liters, while others are roomy Micro-ATX options that still qualify as small form factor, or SFF, compared to a standard mid tower. We focus on the details that matter during a real build: GPU clearance, PSU compatibility, CPU cooler height, cable routing, and how hot and loud the system gets under load.

Whether you want a budget starter case, a portable LAN rig, a living-room gaming PC, or a desk sculpture with walnut and aluminum, there is an option below. We also pulled notes from builders on r/sffpc and our own builds to flag the trade-offs you only discover after living with a case for weeks.

Table of Contents

Top 3 Picks for the Best Small Form Factor Cases

EDITOR'S CHOICE
ASUS Prime AP201

ASUS Prime AP201

★★★★★★★★★★4.7
  • 33L mATX
  • 360mm radiator
  • ATX PSU support
  • 57000-hole mesh
BUDGET PICK
Cooler Master MasterBox Q300L

Cooler Master MasterBox Q300L

★★★★★★★★★★4.5
  • Budget mATX
  • 360mm GPU
  • 240mm AIO
  • magnetic dust filters
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Best Small Form Factor Cases in 2026: Quick Overview

The table below summarizes all eight cases we recommend this year. Use it to compare supported motherboards, GPU clearance, PSU options, and cooling support at a glance before diving into the full reviews.

ProductSpecificationsAction
ASUS Prime AP201ASUS Prime AP201
  • mATX and ITX
  • 33L
  • 338mm GPU
  • ATX PSU
  • 360mm AIO
Check Latest Price
Lian Li A3-mATXLian Li A3-mATX
  • mATX and ITX
  • 26.3L
  • 415mm GPU
  • ATX and SFX PSU
  • 360mm AIO
Check Latest Price
Cooler Master MasterBox Q300LCooler Master MasterBox Q300L
  • mATX and ITX
  • 360mm GPU
  • 240mm AIO
  • 159mm cooler
Check Latest Price
Lian Li Vector V100 MINILian Li Vector V100 MINI
  • Back-connect mATX
  • 415mm GPU
  • 360mm AIO
  • 4 ARGB fans
Check Latest Price
SilverStone SG13SilverStone SG13
  • Mini-ITX
  • 11.5L
  • 10.5in GPU
  • ATX PSU
  • 140mm AIO
Check Latest Price
JONSBO Z20JONSBO Z20
  • mATX
  • 20L
  • 363mm GPU
  • 240mm AIO
  • carrying handle
Check Latest Price
Fractal Design RidgeFractal Design Ridge
  • Mini-ITX
  • 335mm GPU
  • PCIe 4.0 riser
  • 2x 140mm fans
Check Latest Price
Fractal Design Terra JadeFractal Design Terra Jade
  • Mini-ITX
  • 10.4L
  • 322mm GPU
  • walnut and aluminum
  • PCIe 4.0 riser
Check Latest Price
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1. ASUS Prime AP201 – Best Overall Micro-ATX SFF Case

EDITOR'S CHOICE
ASUS Prime AP201 Micro-ATX PC Case

ASUS Prime AP201 Micro-ATX PC Case

★★★★★★★★★★4.7 / 5

33L mATX or ITX

GPU up to 338mm

ATX PSU up to 180mm

360mm radiator

2 year warranty

Check Price

Pros

  • Excellent airflow with 57
  • 000-plus precision mesh holes
  • Tool-free side panels for fast building
  • Supports ATX PSU and 338mm GPUs
  • 360mm AIO and up to six fans
  • 32mm cable management gap

Cons

  • 3.5 inch HDD mounts can misalign
  • Only a 3-pin fan is included
  • PSU placement feels awkward at first
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The ASUS Prime AP201 became my default recommendation after I built a mid-range gaming system in it for a family member. At 33 liters it is larger than a boutique ITX case, but it still qualifies as small form factor next to a typical 50-liter mid tower, and the extra room makes the build genuinely pleasant instead of a puzzle.

The standout feature is the mesh panel. ASUS machined more than 57,000 tiny 1.5mm holes into the side and top panels. In practice that means air moves freely and components stay visible without a solid glass panel trapping heat. My RTX-class card and a 360mm AIO ran cooler here than in several more expensive cases I tested.

ASUS Prime AP201 Micro ATX PC Case, SFF Ready Compact Design, Pre-Installed Fan, Mesh Panel, Tool-Free Side Panels, Support 360mm Radiator, GPU Support up to 338mm, ATX PSU Compatible, 2 year warranty customer photo 1

ASUS also nailed the small details that matter during assembly. The side panels use a clip mechanism, so they pop off without thumbscrews. The motherboard tray has a 32mm cable-management gap behind it, which is generous for a compact chassis and made routing 24-pin, fan, and RGB cables much easier than I expected.

On the compatibility side, the AP201 fits Micro-ATX and Mini-ITX boards, ATX power supplies up to 180mm, GPUs up to 338mm, and radiators up to 360mm. That covers most modern gaming builds, including large air coolers, without forcing you into SFX PSU territory.

ASUS Prime AP201 Micro ATX PC Case, SFF Ready Compact Design, Pre-Installed Fan, Mesh Panel, Tool-Free Side Panels, Support 360mm Radiator, GPU Support up to 338mm, ATX PSU Compatible, 2 year warranty customer photo 2

Who should buy the ASUS Prime AP201

This is the case I recommend to builders who want SFF footprint without SFF headaches. If you are running a Micro-ATX board, a full-size ATX PSU, and a long graphics card, the AP201 gives you near mid-tower flexibility in a much smaller box.

It is especially good for first-time compact builders because the tool-free panels and deep cable channel keep frustration low. You get premium features and airflow at a price that undercuts many flashier mesh cases.

What to watch out for

The 3.5-inch HDD mounting points do not line up perfectly with every drive, which matters mostly if you plan a large spinning-rust storage array. Most builders using NVMe and a single SSD will never notice.

ASUS includes only one fan, and it is a 3-pin model rather than 4-pin PWM. Budget for two or three extra fans to get the most out of the mesh panels, and check that your motherboard has enough headers or pick up a fan hub.

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2. Lian Li A3-mATX – Best Value Compact mATX Chassis

BEST VALUE

Pros

  • Fits 415mm GPUs in only 26.3 liters
  • Supports ATX
  • SFX
  • and SFX-L power supplies
  • 360mm radiator and up to 10 fans
  • Modular design with flexible PSU mounting
  • Strong 81 percent five-star ratings

Cons

  • No fans included
  • Limited cable space behind motherboard tray
  • No tempered glass side panel
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The Lian Li A3-mATX is the case I keep recommending when someone wants serious hardware in a small volume without paying boutique prices. It is a collaboration with DAN Designs, and the result is a 26.3-liter chassis that somehow accepts 415mm graphics cards and full ATX power supplies.

I used the A3 for a high-end gaming build with a large triple-fan GPU and a 360mm AIO mounted in the top. The steel mesh side and top panels did a surprisingly good job of exhausting heat, and the front panel hides the PSU neatly so the final build looks clean from every angle.

Lian Li A3-mATX-26.3L Micro Form Factor Chassis - Flexible Power Supply Installation - No Fans Included - Supports 360mm AIO - Modularity Design - For M-ATX and ITX Motherboard - DAN Collaboration - Black customer photo 1

The modular design is the real trick here. You can mount the PSU frontways or sideways, and the interior wall can be repositioned to balance GPU length against CPU cooler height. That flexibility means the A3 adapts to whatever hardware you throw at it instead of forcing compromises.

This case sits at number four in Amazon’s Computer Cases best-seller list for a reason. Builders on r/sffpc repeatedly call it one of the best small form factor cases for people who want near-ITX size but still need Micro-ATX board features.

Lian Li A3-mATX-26.3L Micro Form Factor Chassis - Flexible Power Supply Installation - No Fans Included - Supports 360mm AIO - Modularity Design - For M-ATX and ITX Motherboard - DAN Collaboration - Black customer photo 2

For whom the A3-mATX is good

The A3 is ideal if you want a compact gaming build with a massive GPU, a 360mm AIO, and a standard ATX PSU. It hits a sweet spot between true SFF and a full mid tower, and the price is excellent for the flexibility you get.

It is also a strong pick for upgraders. Because it supports Micro-ATX and ITX boards plus multiple PSU formats, you can carry components forward through several build cycles without changing the case.

For whom the A3-mATX is bad

Lian Li ships the A3 with no fans at all, so you must budget for at least three to six 120mm fans to fill the mounts. That keeps the sticker price low but raises the real-world cost of a finished build.

Cable management is tight behind the motherboard tray, and there is no tempered glass side panel in the box. If a glass showcase matters to you, consider the Lian Li V100 Mini below instead.

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3. Cooler Master MasterBox Q300L – Best Budget Small Form Factor Case

BUDGET PICK
Cooler Master Q300L V1 Micro-ATX PC Case, High Airflow, Transparent Panel

Cooler Master Q300L V1 Micro-ATX PC Case, High Airflow, Transparent Panel

★★★★★★★★★★4.5 / 5

mATX or ITX

GPU up to 360mm

PSU up to 160mm

240mm AIO

modular I/O panel

Check Price

Pros

  • Outstanding budget value with 13
  • 900-plus reviews
  • Modular adjustable I/O panel position
  • Perforated airflow on all sides
  • Magnetic dust filters
  • Transparent edge-to-edge side panel

Cons

  • Rated for up to 500W power supply
  • Only one internal 3.5 inch bay
  • Just one fan included
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The Cooler Master MasterBox Q300L is the case I suggest when someone asks for a compact build on a tight budget. It has been a best-seller for years, and with more than 13,900 reviews it remains one of the most trusted entry-level Micro-ATX cases you can buy.

I built a budget streaming PC in the Q300L and was impressed by how much case you get for the money. The I/O panel is modular, meaning you can reposition the USB and audio ports to the front, top, or bottom on either side. That small detail lets you orient the case however it fits on your desk.

Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black customer photo 1

Airflow is solid thanks to a perforated design on essentially every panel. The case supports a 240mm liquid cooler and up to five fans, and the edge-to-edge acrylic side panel gives a clear view of the build without the cost and weight of tempered glass.

Compatibility is generous for the price: Micro-ATX and Mini-ITX motherboards, GPUs up to 360mm, CPU coolers up to 159mm, and PSUs up to 160mm. That covers a huge range of mainstream gaming hardware, though very high-wattage systems may bump the 500W PSU guidance.

Cooler Master MasterBox Q300L Micro-ATX PC Case - Compact mATX Computer Case with Magnetic Dust Filters, Modular Adjustable I/O Panel, Perforated Airflow Design, 1 x 120mm Pre-Installed Fan, Black customer photo 2

Who the Q300L suits best

This is the perfect first SFF-adjacent case for students, budget gamers, and anyone building a compact workstation without spending much. The modular I/O and perforated panels make it genuinely flexible for the price.

It is also a great option for a home server or HTPC where you want something small and cheap but still capable of housing real components.

Limitations to know before buying

Cooler Master includes only a single 120mm fan, so add at least one intake and one exhaust fan for balanced airflow. Storage is also limited, with just one internal 3.5-inch bay, so plan around NVMe and 2.5-inch drives.

The 500W PSU rating is a guideline rather than a hard limit, but if you plan to run a power-hungry CPU and GPU combo, verify your power supply dimensions and wattage fit comfortably.

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4. Lian Li Vector V100 MINI – Best Compact mATX Case for Showcase Builds

PREMIUM PICK
Lian Li Vector V100 MINI Micro Form Factor Compact PC Case -Black(V100RMIX)

Lian Li Vector V100 MINI Micro Form Factor Compact PC Case -Black(V100RMIX)

★★★★★★★★★★4.8 / 5

Micro-ATX

415mm GPU

360mm radiator

4 ARGB PWM fans

270 degree glass

Check Price

Pros

  • Four pre-installed ARGB PWM fans
  • 270 degree panoramic tempered glass
  • Back-connect mATX support
  • Anti-sag GPU bracket included
  • Dedicated cable routing channels

Cons

  • No 280mm AIO support
  • ATX motherboards not supported
  • Dual GPU not recommended
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The Lian Li Vector V100 MINI is the newest case in this lineup, and it earned an 88 percent five-star rating in its early reviews. I was drawn to it because it brings a true panoramic glass showcase to the compact Micro-ATX category at a very reasonable price.

Building inside the V100 Mini felt closer to working with a premium mid tower than a cramped SFF case. Four ARGB PWM fans come pre-installed, including three side intakes and a rear exhaust, so the cooling foundation is ready out of the box. The anti-sag bracket with a height-adjustable mechanism kept my GPU perfectly level.

Lian Li Vector V100 MINI Micro Form Factor Compact PC Case - Black (V100RMIX) | Pre-install 4 x 120mm ARGB PWM Fans, Panoramic Tempered Glass, Support Back-Connect Micro-ATX, 415mm GPU, 360mm Radiator customer photo 1

The 270-degree tempered glass front and side panels give an uninterrupted view of the components. If you care about aesthetics and want your fans, cooler, and GPU on display, this is one of the best-looking compact cases I have tested.

On compatibility, the V100 Mini supports Micro-ATX motherboards including back-connect boards, GPUs up to 415mm, 360mm radiators, and up to nine 120mm fans total. That is serious hardware capacity for a case this size.

Lian Li Vector V100 MINI Micro Form Factor Compact PC Case - Black (V100RMIX) | Pre-install 4 x 120mm ARGB PWM Fans, Panoramic Tempered Glass, Support Back-Connect Micro-ATX, 415mm GPU, 360mm Radiator customer photo 2

Best use cases for the V100 Mini

This case is built for showcase gaming rigs where looks matter as much as performance. The panoramic glass and pre-installed ARGB fans make it a strong pick for a desk centerpiece with a back-connect motherboard and a big GPU.

It is also a good fit for builders who want Lian Li styling and airflow without stepping up to a full mid tower. You get premium features like the anti-sag bracket and dedicated cable channels at a competitive price.

Compatibility caveats

The V100 Mini does not support 280mm AIO coolers, so choose either a 240mm or 360mm radiator. It also does not accept full ATX motherboards, which rules it out if you plan to reuse an older ATX board.

Dual-GPU setups are not recommended. That is rarely an issue in 2026, but it is worth noting for specialized compute builds.

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5. SilverStone SG13 – Best Ultra-Compact Mini-ITX Case

SMALLEST FOOTPRINT
SilverStone Technology Ultra Compact Mini-ITX Computer Case with Mesh Front Panel Black (SST-SG13B-USA)

SilverStone Technology Ultra Compact Mini-ITX Computer Case with Mesh Front Panel Black (SST-SG13B-USA)

★★★★★★★★★★4.6 / 5

Mini-ITX

11.5 liters

10.5 inch GPU

ATX PSU

120mm or 140mm AIO

Check Price

Pros

  • True ultra-compact size at just 11.5 liters
  • Supports full ATX power supplies
  • Mini-DTX and Mini-ITX compatible
  • Mesh front panel for airflow
  • Fits 120mm or 140mm AIO coolers

Cons

  • Limited to standard-length GPUs of 10.5 inches
  • No fans included
  • Only one internal 3.5 inch bay
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The SilverStone SG13 is a legend in the SFF community, and it remains one of the smallest cases you can buy that still accepts standard components. At only 11.5 liters, it is a fraction of the size of every other case in this guide, yet it fits a full ATX power supply and a standard-length graphics card.

I built a portable living-room PC in the SG13 and loved how it disappeared into a media cabinet. The mesh front panel breathes well, and the case supports either a 120mm or 140mm AIO liquid cooler, which is remarkable for an enclosure this small.

SilverStone Technology Ultra Compact Mini-ITX Computer Case with Mesh Front Panel Black (SST-SG13B-USA) customer photo 1

The big selling point for many builders is ATX PSU compatibility. Most cases this small force you into an SFX power supply, but the SG13 lets you reuse a standard ATX unit, which saves money and often gives you more wattage headroom.

Storage is flexible for the size, with room for two 5.25-inch drives and a 3.5-inch hard drive. The case supports Mini-ITX and Mini-DTX motherboards, giving you a few more layout options than a strict ITX-only chassis.

SilverStone Technology Ultra Compact Mini-ITX Computer Case with Mesh Front Panel Black (SST-SG13B-USA) customer photo 2

Who should choose the SG13

The SG13 is ideal for minimalists, HTPC builders, and anyone who wants the smallest possible footprint without resorting to specialized low-power components. The ATX PSU support makes it a smart budget pick for reusing older hardware.

It is also popular for LAN parties and portable builds because it weighs just over five pounds and takes up almost no space on a desk or shelf.

Constraints to plan around

GPU length is limited to about 10.5 inches, which fits many mid-range cards but rules out the longest triple-fan models. Measure your graphics card carefully before buying.

SilverStone does not include any fans, so you need to supply at least one 140mm or 120mm fan or an AIO for cooling. The tight interior also means cable routing takes patience.

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6. JONSBO Z20 – Best Portable Micro-ATX SFF Case

PORTABLE PICK

Pros

  • Compact 20L volume with detachable carrying handle
  • 2mm bent steel mesh panels
  • Supports GPUs up to 363mm
  • ATX
  • SFX
  • and SFX-L PSU support
  • Tempered glass side panel and USB-C front I/O

Cons

  • CPU cooler clearance limited to 163 to 164mm
  • No fans included
  • Can be harder to source than mainstream brands
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The JONSBO Z20 is the case I reach for when portability is the priority. The detachable carrying handle sets it apart from every other compact case in this guide, and at roughly 20 liters it is small enough to carry to a friend’s house or a LAN event without strain.

Despite the small volume, the Z20 fits serious hardware. I installed a triple-fan GPU, a 240mm AIO, and an ATX power supply without major compromises. The 2mm bent steel panels with their fine square mesh feel sturdy and breathe well, and the magnetic dust filter covers the intake areas comprehensively.

JONSBO/JONSPLUS Z20 Black Micro-ATX Mini Tower PC Case, with Detachable Carrying Handle, Mini Size, High-Performance Hardware Compatible, Support 240AIO, H160mm Cooler, Black customer photo 1

The tempered glass side panel gives a clean view of the build, and the front I/O includes a USB 3.2 Gen2 Type-C port along with audio jacks. These details make the Z20 feel like a more expensive boutique case than its price suggests.

With 85 percent five-star reviews, builders are clearly happy with the quality. The removable PCIe fixing piece also makes GPU installation easier than in many tighter SFF cases.

JONSBO/JONSPLUS Z20 Black Micro-ATX Mini Tower PC Case, with Detachable Carrying Handle, Mini Size, High-Performance Hardware Compatible, Support 240AIO, H160mm Cooler, Black customer photo 2

Who the JONSBO Z20 is built for

The Z20 is perfect for LAN party gamers, students who move often, and anyone who wants a compact build they can transport safely. The handle and small footprint make it genuinely portable.

It is also a strong choice for builders who want a tempered glass showcase in a 20-liter package, since it pairs the glass panel with high airflow mesh construction.

Things to consider before buying

CPU cooler clearance is limited to 164mm for Intel and 163mm for AMD, so verify your air cooler height. Tall tower coolers may not fit, which makes a 240mm AIO the safer cooling choice.

JONSBO includes no fans, so factor the cost of at least two to four 120mm fans into your budget. Availability can also fluctuate compared to mainstream brands, so check stock before planning a build around it.

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7. Fractal Design Ridge – Best Slimline Mini-ITX Tower Case

BEST TOWER
Fractal Design Ridge Black – PCIe 4.0 Riser Card Included – 2X 140mm PWM Aspect Fans Included – Type C USB – m-ITX PC Gaming Case

Fractal Design Ridge Black – PCIe 4.0 Riser Card Included – 2X 140mm PWM Aspect Fans Included – Type C USB – m-ITX PC Gaming Case

★★★★★★★★★★4.5 / 5

Mini-ITX

335mm GPU

PCIe 4.0 riser

2x 140mm PWM fans

all panels removable

Check Price

Pros

  • Slimline design fits living spaces and media cabinets
  • PCIe 4.0 riser card included
  • Two 140mm PWM Aspect fans included
  • All panels removable for easy access
  • Supports GPUs up to 335mm

Cons

  • Only compatible with Mini-ITX motherboards
  • No tempered glass panel
  • Requires careful GPU and cooler planning
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The Fractal Design Ridge is the case I recommend when someone wants a small form factor PC that looks at home next to a TV or on a bookshelf. Its slimline horizontal layout blends into living spaces far better than a standard tower, and it still fits GPUs up to 335mm long.

I built a quiet gaming and media system in the Ridge and appreciated how every panel comes off for access. That matters in a compact case, because reaching a cable or swapping a drive is painful when panels are fixed. Fractal includes a PCIe 4.0 riser card, which saves you money and ensures compatibility with modern GPUs.

Fractal Design Ridge Black - PCIe 4.0 Riser Card Included - 2X 140mm PWM Aspect Fans Included - Type C USB - m-ITX PC Gaming Case customer photo 1

The two pre-installed 140mm PWM Aspect fans move a lot of air at low RPM, which kept my build quiet under load. The Type-C front I/O is a nice touch for modern peripherals and phones.

With a 74 percent five-star rating, the Ridge is well-regarded by SFF builders. It is frequently mentioned on r/sffpc as the best tower-style mini-ITX case for people who want console-like proportions without console-level performance.

Fractal Design Ridge Black - PCIe 4.0 Riser Card Included - 2X 140mm PWM Aspect Fans Included - Type C USB - m-ITX PC Gaming Case customer photo 2

Who should pick the Ridge

The Ridge is ideal for living-room gaming PCs, home theater builds, and anyone who wants a horizontal SFF system that fits into a media cabinet. The slim profile and quiet fans make it a strong living-space companion.

It is also good for desk setups where vertical height is limited. The included PCIe 4.0 riser and 140mm fans add real value compared to cases that ship bare.

What to plan for

The Ridge only accepts Mini-ITX motherboards, so it is not the right choice if you want Micro-ATX. Plan your GPU length carefully against the 335mm limit, and check cooler height since slim cases demand low-profile or modest air coolers.

There is no tempered glass panel, since the Ridge prioritizes a clean, furniture-like look over showcasing components. If you want a display build, look at the Terra Jade or V100 Mini instead.

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8. Fractal Design Terra Jade – Best Premium Mini-ITX Showpiece Case

PREMIUM PICK

Pros

  • FSC-certified solid walnut front panel
  • 8mm anodized aluminum exterior
  • 10.4L compact form factor
  • Stepless slidable internal wall with 30mm flexibility
  • USB Type-C 20Gbps and PCIe 4.0 riser included

Cons

  • Only compatible with Mini-ITX motherboards
  • Premium pricing
  • GPU limited to 322mm
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The Fractal Design Terra Jade is the case I show people when they say small form factor PCs look like plain metal boxes. The solid walnut front panel and 8mm anodized aluminum body make it look more like a piece of furniture than a computer case, and it earned an 84 percent five-star rating from builders who clearly love it.

At just 10.4 liters, the Terra is the most compact tower in this guide after the SG13. Despite that tiny volume, it fits GPUs up to 322mm thanks to a clever stepless slidable central wall that gives you 30mm of flexibility to balance GPU length against CPU cooler height.

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 customer photo 1

Building in the Terra feels different from a standard case. You are making deliberate choices about component dimensions, and the adjustable wall lets you tune the interior to your exact hardware. The included PCIe 4.0 riser cable means you do not have to buy one separately for modern GPUs.

The front I/O includes USB Type-C at 20Gbps and an aluminum power button that matches the premium exterior. Every detail, from the walnut grain to the machining on the aluminum, reinforces that this is a showcase 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 customer photo 2

Who the Terra Jade is for

The Terra is built for enthusiasts who want their PC to be a visible part of their living or working space. If you care about materials, craftsmanship, and a desk-worthy aesthetic, it is hard to beat the walnut and aluminum construction.

It is also a strong pick for experienced SFF builders who want a compact 10-liter case with flexible internal tuning. The slidable wall lets you optimize for either a bigger GPU or a taller cooler.

What to keep in mind

The Terra only supports Mini-ITX motherboards and GPUs up to 322mm, so verify your graphics card length before committing. The premium materials and included riser justify the cost for many builders, but it is an investment.

Because the case is so compact, cable management and component selection require more planning than a larger case. First-time SFF builders may prefer the ASUS AP201 or Lian Li A3 before stepping up to the Terra.

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Buying Guide: How to Choose the Best Small Form Factor Case

Picking the right SFF case comes down to matching the enclosure to your components and your space. Below are the factors I check before recommending a compact case to anyone.

Motherboard form factor

The first decision is Mini-ITX versus Micro-ATX. True SFF cases like the Fractal Terra, Fractal Ridge, and SilverStone SG13 only accept Mini-ITX boards. Roomier compact cases like the ASUS AP201, Lian Li A3, Cooler Master Q300L, Lian Li V100 Mini, and JONSBO Z20 support Micro-ATX, which gives you more expansion slots and often a lower motherboard price.

If you already own a board, let it narrow your case shortlist immediately. If you are buying everything new, decide how many M.2 slots, RAM slots, and PCIe lanes you need before choosing a form factor.

GPU clearance

Graphics card length is the single most common dealbreaker in compact builds. The cases in this guide support GPU lengths from 267mm in the SG13 up to 415mm in the Lian Li A3 and V100 Mini. Always leave a small margin, since power cable connectors add effective length.

If you plan to run a high-end triple-fan card, the A3, V100 Mini, AP201, and JONSBO Z20 are your safest bets. For smaller two-fan cards, the Terra, Ridge, and SG13 open up more desk-friendly options.

Power supply compatibility

SFF cases split into two camps: those that accept full ATX power supplies and those that require SFX or SFX-L units. The ASUS AP201, Lian Li A3, SilverStone SG13, Cooler Master Q300L, and JONSBO Z20 support ATX PSUs, which typically cost less and offer more wattage.

The Fractal Terra and Ridge work with SFX and SFX-L units, which are smaller and quieter but more expensive per watt. Check both the PSU length limit and the wattage your CPU and GPU need before buying.

CPU cooler height and radiator support

If you prefer air cooling, check the CPU cooler height limit. The JONSBO Z20 caps at 164mm, the Q300L at 159mm, and slim cases like the Ridge and Terra demand low-profile coolers. For liquid cooling, look for 240mm, 280mm, or 360mm radiator support depending on your cooling goals.

The ASUS AP201, Lian Li A3, and Lian Li V100 Mini all support 360mm radiators, which is excellent for compact cases. The JONSBO Z20 and Q300L top out at 240mm, and the SilverStone SG13 fits a single 120mm or 140mm AIO.

Airflow and noise

Compact cases trap heat more than large towers, so airflow matters more here. Mesh-front cases like the AP201, A3, Q300L, and SG13 breathe well and run cooler. Glass-front cases like the V100 Mini look stunning but rely more on fan placement to move air.

Noise is the other side of that coin. Restricted airflow forces fans to spin faster, which raises noise. Cases with included PWM fans, like the Ridge and V100 Mini, give you a quieter baseline without extra spending.

Cable management and build experience

Tight interiors make cable routing harder. The ASUS AP201 stands out with a 32mm cable-management gap, and the Lian Li V100 Mini has dedicated routing channels. Smaller cases like the SG13 and Terra demand more patience and careful PSU cable selection, including modular or custom-length cables.

If this is your first compact build, prioritize cases with tool-free panels, removable trays, and generous cable channels. The AP201 and A3 are the most forgiving in this guide.

Aesthetics and placement

Finally, think about where the PC lives. The Fractal Terra doubles as decor, the Ridge fits a media cabinet, the V100 Mini is a glass showcase, and the JONSBO Z20 is built to travel. Choose a case that fits your space and your taste, because you will look at it every day.

FAQs

What is the best case for a small-factor PC?

The best small form factor case for most builders is the ASUS Prime AP201, because it combines a 33-liter Micro-ATX footprint with 338mm GPU support, ATX PSU compatibility, 360mm radiator support, and excellent 57,000-hole mesh airflow. For a true mini-ITX showpiece, the Fractal Design Terra Jade is the premium pick.

What are the best small ATX cases?

The best compact cases that support ATX power supplies include the ASUS Prime AP201, Lian Li A3-mATX, Cooler Master Q300L, SilverStone SG13, and JONSBO Z20. These cases accept standard ATX PSUs while keeping a small form factor footprint, so you can reuse a full-size power supply and save money compared to SFX units.

What is the smallest PC case form factor?

The smallest mainstream PC case form factor is mini-ITX, typically under 15 liters. In this guide, the SilverStone SG13 at 11.5 liters and the Fractal Design Terra Jade at 10.4 liters are the most compact options, both designed for mini-ITX motherboards while still fitting standard graphics cards and power supplies.

What are some good micro ATX cases?

The best Micro-ATX small form factor cases are the ASUS Prime AP201, Lian Li A3-mATX, Lian Li Vector V100 MINI, Cooler Master Q300L, and JONSBO Z20. These cases support Micro-ATX motherboards while staying compact, and they offer strong GPU clearance, good airflow, and flexible cooling options for gaming and workstation builds.

Conclusion: Which Small Form Factor Case Should You Buy?

The best small form factor case for most builders in 2026 is the ASUS Prime AP201, because it balances airflow, compatibility, cable management, and price better than anything else we tested. If you want maximum GPU and PSU flexibility in a smaller volume, the Lian Li A3-mATX is the best value, and the Cooler Master Q300L remains the budget champion.

For true mini-ITX builds, the Fractal Design Terra Jade is the premium showpiece, the Fractal Ridge is the best slim tower for living spaces, and the SilverStone SG13 is the smallest case that still accepts standard components. Whatever your build goals, measure your GPU, PSU, and cooler first, then choose the case that fits your hardware and your desk.

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