SFX energy provides are an actual life instance for PC builders to show “Happiness also comes in small packages.” Because two PSUs, one ATX and one other SFX (with similar specs) can ship the identical energy and effectivity to your setup regardless of the smaller dimension of the SFX ones. This form of PSU is 125mm extensive, 63.5mm tall and 100mm deep. The SFX PSUs even have a SFX-L variant that has fairly a bigger depth for accommodating bigger followers. Referring to some SFX PSUs I personal, like a CORSAIR SF600, I can affirm that the size specified by the SFX customary are correct, though it could barely range for different fashions. Strengths: Best suited to compact builds like Mini-ITX and Small Form Factor Small but highly effective and environment friendly for gaming PCs Weaknesses: High wattage PSUs usually are not obtainable for constructing high-end rigs Expensive than ATX ones (for similar specs)