Seasonic SSP-300SFG 300 W SFX power supply

Compact SFX power supply for small-form-factor

The Seasonic SSP-300SFG is a 300 W SFX12V unit designed for compact cases where space is at a premium. Its 140 mm length and single-fan layout leave room for unrestricted airflow. The supply is Haswell ready and carries 80 PLUS Gold certification for high efficiency. Japanese capacitors and a DC-to-DC converter design support stable output across varying loads.

300 W capacity with a single +12 V rail at 25 A

The +12 V rail delivers up to 25 A, covering the needs of mainstream CPUs and mid-range graphics cards in tight enclosures. Minor rails provide 3.3 V at 10 A and 5 V at 14 A for legacy drives and peripherals. Peak combined output reaches 300 W, so sustained heavy loads on both CPU and GPU may exceed the unit's headroom. Three SATA connectors and a 4+4-pin CPU plug handle typical storage and processor power.

80 PLUS Gold efficiency at 87 % typical

The 80 PLUS Gold rating means the supply runs at 87 % typical efficiency, reducing waste heat and electricity cost. Active PFC corrects the power factor across a 100 to 240 V input range. Protections include over-voltage, short-circuit and over-power safeguards on all outputs. A super-low-noise fan control keeps acoustic output minimal during light workloads.