The SFX series is designed with the latest technologies and efficiency standards in mind to ensure reliable voltage and power stability for sufficiently powerful graphics cards. The combination of high-quality circuitry, quiet operation, and high efficiency makes SFX Power models an perfect choice for owners of compact systems.

They differ from the classic ATX models in compact dimensions: the height of such a power supply is usually limited to 64 mm, the depth does not exceed 130 mm, but the turntable can have a standard diameter of 120 mm. However, models with reduced coolers with a diameter of 60 – 80 mm are more common on the market. In turn, the power outlets of SFX format models are almost completely similar to the original ATX.


The design of the SFX series models supports the latest technologies and efficiency standards, providing reliable voltage stability and sufficient power for powerful graphics cards. The combination of silent operation, thoughtful functions and high efficiency makes SFX Power power supplies an perfect choice for users of compact systems.

Given the specifics of the SFX line, its model range is dominated by power supplies with not the largest power reserve. In simpler variants, this figure may be in the region of 300 watts, while the limit for the most performant modifications does not exceed 600 watts. Otherwise, these power supplies differ from each other due to their dimensions, the number of connectors and the set of available protections.

In terms of price, relevance and popularity, the Be quiet SFX Power 3 device is in the greatest demand. This is the most technically advanced variation of a compact power supply with impressive acoustic characteristics (note: the limit of 29 dB at peak load), efficiency in the region of 89% (there is a bronze certificate), a powerful main 12V line and all necessary safety measures on board. At a price of $50 for the 300-watt version, SFX Power 3 doesn't have many competitors.