Complex sentence: Thus, an SFX power supply is mostly pin-compatible with the ATX power supply as the main difference is its reduced dimensions; the only electrical difference is that the SFX specifications do not require the − 5 V rail.
Split into simpler sentences: Thus, an SFX power supply is mostly pin-compatible with the ATX power supply as the main difference is its reduced dimensions. The only electrical difference is that the SFX specifications do not require the − 5 V rail.