SFX power refers to a specific type of power supply. It is the abbreviation of Small Form Factor, meaning "small chassis specification". It is a compact standard specification of PC power supply, with the core feature being small size and compatibility with small chassis. It is specifically designed for ITX (mini) and DTX type small computers, and is one of the two main PC power supply specifications that we commonly see (the standard large chassis power supply). The main feature is "compromising on space but maintaining performance without any reduction". It is a miniaturized power supply solution. 

It is a small power supply standard formulated by Intel. By optimizing the internal structure and reducing the size of components, it ensures the power supply capacity while compressing the size to approximately half of the conventional ATX power supply, addressing the problem of "not being able to fit the standard power supply" in small chassis, and is also compatible with some compact MATX chassis. 

Key features of SFX power supply (distinguished from ATX power supply) 

1. Volume (the core difference): Standard SFX power supply dimensions: 125mm (length) × 100mm (width) × 63.5mm (height) 

Compared with ATX power supplies (commonly 150×140×86mm in size): The volume has been reduced by approximately 40%-50%, making it easy to fit into ITX-sized cases (such as those under 20L, like mini cases). Derived specifications: SFX-L (extended version, 130mm in length), with higher power (up to 1000W), compatible with SFX installation slots, balancing small size and high performance. 

2. Interface and Compatibility: Motherboard power supply interface: Consistent with ATX power supply (24-pin motherboard interface + 4-pin/8-pin CPU power supply interface), does not affect motherboard compatibility. Module design: Most mid-to-high-end SFX power supplies are "all-module" (wires can be freely plugged and unplugged), further saving internal space of small cases and avoiding messy wires. Installation position: Requires the case to support "SFX power position". Some ATX cases can install SFX power supplies through adapter brackets (but it is not necessary, as it wastes space). 

3. Power and Performance: Power Range: 350W - 1000W. It can be compatible with entry-level integrated graphics desktops (350W) to high-end ITX gaming desktops (1000W, such as i9 + RTX 4090). Performance: The conversion efficiency and stability of mid-to-high-end SFX power supplies (such as 80PLUS Gold / Platinum certified, LLC architecture) are on par with those of the same specification ATX power supplies. However, due to the small size, higher requirements are imposed on cooling and component materials. 

III. Application scenarios for SFX power supplies: ITX mini computers: such as desktop office mini computers, portable gaming consoles, NAS servers (with limited space and requiring SFX); small HTPC (home theater computers): need to fit into a TV cabinet and have strict volume restrictions; users who desire the utmost desktop tidiness: even with a MATX case, still want to save space through SFX power supply, for ease of cable routing and installation of liquid cooling systems. 

The SFX power supply can be adapted to different-sized cases through an adapter or an installation bracket. In summary, the SFX power supply is a "miniaturized PC power supply", with the core value of "saving space". It is suitable for scenarios where there are specific requirements for the size of the case. Its performance and durability fully meet the needs of mainstream and even high-end computers. If installing an ITX computer, the SFX power supply is a must-have option.