KHACHIMO 400W ATX power supply 80 PLUS Gold 12V 31A

400W ATX Power Supply for Efficient Builds

This 400 watt ATX unit targets system builders who want 80 PLUS Gold efficiency and Modern Standby compatibility in a standard form factor. It supplies a 12V rail rated at 31A to support mainstream components. The resonant LLC topology with DC-to-DC conversion delivers stable voltage regulation for reliable daily operation. It is not suited for high-end multi-GPU configurations or workstations demanding substantially higher peak output.

Capacity and Headroom on the 12V Rail

The single 12V rail provides 31 amps, which comfortably handles mid-range graphics cards and modern CPUs under typical gaming or productivity loads. Total continuous output is rated at 400 watts, so sustained heavy overclocking or dual-card setups will exceed the available headroom. Peak demand above this level triggers protection circuits to prevent damage. Builders planning future upgrades to power-hungry parts should verify their total system draw against this limit.

Thermals, Noise and Power Draw

80 PLUS Gold certification means the unit runs efficiently, reducing waste heat and overall power draw at typical loads. A Zero RPM fan mode stops the cooling fan entirely at low and medium loads for near-silent operation. The resonant LLC design further minimises coil whine, contributing to a quieter acoustic profile. Under heavier loads the fan engages to maintain safe temperatures while preserving efficiency.