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A plain black ATX power supply unit with a metal casing and cooling fan visible on one side

KHACHIMO

KHACHIMO ACE-841AP 400W ATX power supply

SKU CH-T405-GC7BK

Delivers 400 W of ATX power for desktop builds, tested and listed in 2024

  • Product typeATX
  • 400 W output powers mainstream desktop builds
  • ATX form factor fits standard PC cases
  • Tested working before shipment ensures reliability
  • Good quality components support stable operation
  • Listed by manufacturer on 14 March 2024

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.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $283.99
Pricier than about 75% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeATX

Questions about this item

Will the ATX form factor of the KHACHIMO ACE-841AP fit my older case and motherboard?

The ATX form factor matches standard case cut-outs and motherboard power connectors used for many years.

How can I verify the 400W ACE-841AP is working correctly after installation?

The unit is test working from the factory; a successful POST and stable operation under load confirm it is functioning as intended.

What cables come attached to the ACE-841AP and what must I source separately?

The power supply ships with its native ATX cables permanently attached; no modular cables are included in the box.

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