KHACHIMO HF400W-ST 48V 8.3A 400W ATX power supply

Modern Standby Ready ATX Power Supply

The KHACHIMO HF400W-ST is a 400 W ATX power supply built for systems that use Modern Standby sleep states. Its 48 V rail delivers up to 8.3 A, supporting fast wake-from-sleep times and improved low-load efficiency. The unit suits compact or efficiency-focused desktop builds that prioritise quiet, reliable power delivery.

80 PLUS Gold Efficiency with Fanless Low-Load

Certified 80 PLUS Gold, the supply reduces wasted energy, heat and noise across typical workloads. A Zero RPM fan mode stops the cooling fan entirely at low and medium loads for near-silent running. Resonant LLC topology with DC-to-DC conversion provides clean, consistent power while enabling deeper, more energy-efficient sleep states without extra cables or adapters.

Sustained Load Stability Through Resonant LLC Design

Under continuous demand the resonant LLC topology maintains tight voltage regulation and low ripple, protecting sensitive components during long work sessions. DC-to-DC conversion minimises coil whine even when the unit runs at higher output. The fan remains off until thermal thresholds require active cooling, so acoustics stay low throughout extended operation.