What Is a Small Form Factor (SFF) PC?
A small form factor PC is a desktop computer built into a case under 20 litres. For reference, a standard mid-tower is 40 to 50 litres. An SFF build is less than half that size but runs the same processors, graphics cards, and memory. Nothing is compromised, nothing is cut down. It is a full desktop in a fraction of the footprint.
What Makes a PC "Small Form Factor"?
The 20-litre threshold is the generally accepted line. Below that, you're in SFF territory. Some cases go as low as 7 to 10 litres. The key enabler is the Mini-ITX motherboard (170 x 170mm), which packs a PCIe slot, two or four RAM slots, and multiple M.2 connectors into a board smaller than a dinner plate.
The modern SFF scene grew out of community projects like the Dan A4-SFX and NCase M1 in the mid-2010s. Those proved high-end hardware could work in tiny enclosures. Today, cases like the Fractal Design Terra, FormD T1, and NCASE M2 have pushed the category further with better airflow, easier building, and cleaner aesthetics.
Why Choose an SFF PC?
Desk space
An SFF case sits on top of your desk without dominating it. For multi-monitor setups where every centimetre counts, that matters.
No performance trade-off
Current SFF cases fit full-length GPUs (up to 330mm+), desktop CPUs on AM5 or LGA 1851, and standard DDR5 memory. A Ryzen 9 or Core Ultra doesn't care if it's in a 12-litre case or a 50-litre tower.
Better thermals than you'd expect
A smaller case means a shorter airflow path. Cool air in, hot air out, less dead space for heat to stagnate. With mesh panels and proper fan placement, many SFF builds match or beat mid-towers on thermals.
Portability
Most SFF cases fit in a rucksack. Moving between home and office, going to a LAN event, or just rearranging your room becomes trivial.
What Goes Into an SFF Build?
The case decides everything. It sets the limits for GPU length, CPU cooler height, and PSU form factor. Most SFF builds use an SFX or SFX-L power supply (shorter than ATX, same wattage) and M.2 NVMe storage to eliminate drive bays and cables. Cooling is typically a compact tower cooler or AIO liquid cooler, depending on the case's clearances.
The motherboard is Mini-ITX. Despite its size, modern Mini-ITX boards have solid power delivery, multiple M.2 slots, high-speed networking, and comprehensive rear I/O. You're not losing features, you're just using a denser layout.
Who Is It For?
Gamers who want a clean setup without a tower on the floor. Creators who need GPU horsepower for editing and rendering but don't have studio space. Remote workers who want real desktop performance at home without dedicating a corner to a PC. AI and ML developers who need a GPU workstation that doesn't take over a desk.
If you're considering one, our configurator lets you spec out an SFF build to your exact needs.
Frequently Asked Questions
Can an SFF PC handle gaming?
Yes. Same GPUs, same CPUs, same frame rates. The case size doesn't affect performance.
Are SFF PCs harder to build?
Yes. Every millimetre matters, so you need to carefully check GPU length, cooler height, and PSU clearance before buying anything. Cable management is tighter, some builds need custom cables or 3D-printed brackets, and troubleshooting is harder when you can't just reach in. It's a rewarding process but not a beginner project. That's why many people go with a specialist builder.
Do SFF PCs overheat?
Not if the case is well designed. Mesh panels and short airflow paths keep thermals in check. Most quality SFF cases perform on par with mid-towers.
What's the difference between SFF and Mini-ITX?
Mini-ITX is a motherboard size (170 x 170mm). SFF describes the whole build. Most SFF PCs use Mini-ITX boards, but the terms aren't interchangeable.
How much does an SFF PC cost?
More than an equivalent ATX build. SFF cases are precision-engineered and priced accordingly, SFX power supplies cost more than ATX equivalents, and you may need custom cables, 3D-printed mounting brackets, or specific low-profile coolers. The core components (CPU, GPU, RAM, storage) cost the same, but the SFF-specific parts add up. Expect a noticeable premium over a standard mid-tower build.
Neox Computers designs and builds custom small form factor PCs for customers across the globe. Every system is assembled, cable-managed, stress-tested, and shipped internationally with full warranty support. Whether you need a compact gaming PC, a portable creative workstation, or a GPU-dense machine learning rig, we configure it around your exact requirements. Start your SFF build here.