We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Rectangular ATX power supply unit in black metal casing with cooling fan and cable bundle

KHACHIMO

KHACHIMO BTX-400SEL-P4 300W 400W 80 PLUS Gold ATX power supply

SKU CH-A7DW-SFSFD

An 80 PLUS Gold ATX unit delivering 300 W continuous and 400 W peak power with Modern Standby support, zero-RPM fan mode and resonant LLC plus DC-to-DC conversion for clean, quiet operation

  • TypeATX
  • Modern Standby support enables faster wake-from-sleep transitions
  • 80 PLUS Gold certification reduces power draw and heat output
  • Zero RPM fan mode stops the fan at low and medium loads for silent running
  • Resonant LLC with DC-to-DC conversion delivers clean power and cuts coil whine
  • Rated 300 W continuous with 400 W peak capacity for stable ATX performance

300W ATX power supply for modern standby systems

The KHACHIMO BTX-400SEL-P4 delivers a continuous 300W output with a 400W peak rating. It carries 80 PLUS Gold certification for high efficiency across typical loads. Resonant LLC topology with DC-to-DC conversion provides clean power and reduces coil whine. The unit is built for PCs that use modern standby sleep states.

Check ATX fit and cable reach before ordering

Verify that your chassis accepts a standard ATX form-factor supply and that the fixed cables reach every component. Ensure the motherboard power connector matches your board’s pin layout. Confirm the total system draw stays within the 300W continuous rating. The zero-RPM fan mode operates at low and medium loads.

Replaces older ATX units lacking modern standby

This supply upgrades systems that cannot enter low-power sleep states efficiently. The jump is worthwhile when you need faster wake times and quieter operation at idle. It suits builds moving from basic Bronze or unrated units to Gold efficiency. Buyers needing more than 300W continuous power should look elsewhere.

Highlights

  • Modern Standby support enables faster wake-from-sleep transitions
  • 80 PLUS Gold certification reduces power draw and heat output
  • Zero RPM fan mode stops the fan at low and medium loads for silent running
  • Resonant LLC with DC-to-DC conversion delivers clean power and cuts coil whine
  • Rated 300 W continuous with 400 W peak capacity for stable ATX performance

Specifications

TypeATX

Questions about this item

Does the BTX-400SEL-P4 come with all necessary power cables for a standard ATX build?

The unit ships with the fixed ATX power cables needed for a typical desktop installation. No separate cable kit is required.

Should I size this PSU by the 300 W rated or the 400 W peak figure?

Plan the build around the 300 W continuous rating; the 400 W peak only covers short transient spikes.

How does the 80 PLUS Gold rating affect daily power draw and heat?

Gold certification means the supply runs at high efficiency across typical loads, lowering electricity use and reducing waste heat inside the case.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.