As small form SFX PSU (SFF, mini-ITX, or ITX) become increasingly popular and commonplace, more and more power supplies are designed with these compact systems in mind. This is where SFX PSU comes in, as it provides a much smaller footprint than ATX models but maintains the functionality and connectors required for most modern builds.

SFX PSU is also known as TFX and TX. The main difference between SFX and ATX is the shorter depth of SFX models, which allows them to fit in cases that wouldn’t allow an ATX-sized PSU to do so. SFX and TX also differ in that SFX models tend to have more power density, with the capability of supporting higher wattage requirements for a given size.

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One of the top SFX PSU options currently available is Corsair’s SF600, which offers a nice middle ground between lower wattage options and the 550W mark. This is one of the highest-rated SFX PSUs that can be found on the market, and it delivers consistent performance with 80 PLUS Platinum efficiency.

Another option is FSP’s Dagger Pro 850, which is a high-end SFX PSU that makes SFF enthusiasts do a double take at the sheer amount of power that it can provide. While it can’t quite handle the RTX 2080 and above that SFF users have been stuck at with the 600 to 750 watt pseudo cap, it still offers plenty of room for upgrades down the road and is a solid pick for most SFF PCs.