KHACHIMO ACE-841AP 400W ATX power supply

400 W ATX power supply

The KHACHIMO ACE-841AP is a 400 W ATX power supply built for basic desktop systems. It suits office PCs, home builds and light productivity rigs that draw modest power. Tested working and described as good quality, it ships new and ready to install.

400 W capacity and headroom

At 400 W the unit comfortably handles a modern CPU with integrated graphics or a low-power dedicated card. It runs out of headroom once a mid-range or high-end GPU is added, or when multiple drives and expansion cards push sustained draw higher. The design targets standard ATX loads without extra connectors for heavy peripherals.

Upgrade path and when to step up

This supply replaces an ageing or lower-wattage unit in an existing ATX case. The jump is worth it when the current PSU cannot deliver stable power for a new CPU or entry graphics card. Builders who need more storage bays, dual high-power GPUs or sustained loads above 400 W should look elsewhere.