KHACHIMO 1U 400W Power Supply P1H-5407V

Compact 400W 1U ATX PSU

The KHACHIMO 1U 400W Power Supply P1H-5407V is an ATX unit built for slim server and workstation chassis where vertical space is at a premium. Its 400 watt rating supports mainstream CPUs and single-GPU configurations in 1U rackmounts or small-form-factor desktops. 80 PLUS Gold certification means high efficiency across typical loads, reducing waste heat and electricity draw. Modern Standby compatibility enables extremely fast wake-from-sleep transitions and improved low-load efficiency for always-on deployments.

Gold efficiency with semi-passive cooling

Resonant LLC topology paired with DC-to-DC conversion delivers clean, consistent power while minimising coil whine and supporting deeper sleep states. The Zero RPM fan mode stops the cooling fan entirely at low and medium loads, yielding near-silent operation during idle or light workloads. Gold-rated efficiency keeps internal temperatures lower, which contributes to component longevity and quieter fan curves when the fan does spin. The 1U form factor dictates a compact internal layout optimised for directed airflow in dense enclosures.

Verify 1U clearance and ATX connector fit

Confirm your chassis accepts a 1U-height power supply and that the mounting holes align with the P1H-5407V bracket pattern. Ensure the ATX main power and CPU/EPS connectors reach the motherboard headers in your specific layout, as short cables are common in 1U designs. Check that total system draw under peak load stays within the 400 watt limit, especially if adding discrete GPUs or many drives. Validate that your motherboard firmware supports Modern Standby to benefit from the fast wake and low-power sleep features.