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
Silver 1U flex ATX power supply unit with fan grille and cable bundle

KHACHIMO

KHACHIMO FSP FLEX 1U K39 600W Power Supply

SKU CH-VN0S-9EFVB

An ATX power supply delivering 600 W with 80 PLUS Gold efficiency, zero-RPM fan mode and Modern Standby support for fast wake times

  • TypeATX
  • Fast wake-from-sleep with Modern Standby support
  • Lower power draw and cooler running via 80 PLUS Gold efficiency
  • Near-silent operation at low loads with Zero RPM fan mode
  • Clean, stable power delivery using resonant LLC topology with DC-to-DC conversion
  • 600 W capacity in a compact 1U form factor

FSP Flex 1U 600W PSU

The KHACHIMO FSP Flex 1U K39 is a 600W ATX power supply built for compact 1U chassis. It carries 80 PLUS Gold certification and supports Modern Standby for rapid wake times. Resonant LLC topology with DC-to-DC conversion delivers clean power and reduces coil whine. Zero RPM fan mode stops the fan at low and medium loads for near-silent operation.

Suits dense 1U builds needing Gold efficiency

This unit fits servers or workstations that require 600W in a 1U form factor with high efficiency and quiet running. It is not for systems demanding more than 600W of continuous power. Builders needing ATX sizing or higher wattage should look at other form factors. The fixed 1U dimensions limit use in standard desktop cases.

600W capacity for single-GPU or multi-drive loads

The 600W rating comfortably handles a modern CPU, a single mid-range GPU and several storage drives. Headroom shrinks with high-end graphics cards or dual-GPU configurations. Sustained loads near the limit will spin the fan and reduce acoustic advantage. Plan total system draw below 600W for reliable, quiet operation.

Highlights

  • Fast wake-from-sleep with Modern Standby support
  • Lower power draw and cooler running via 80 PLUS Gold efficiency
  • Near-silent operation at low loads with Zero RPM fan mode
  • Clean, stable power delivery using resonant LLC topology with DC-to-DC conversion
  • 600 W capacity in a compact 1U form factor

Specifications

TypeATX

Questions about this item

What motherboard power connector does the FSP FLEX 1U K39 600W require?

The unit is an ATX-type supply, so it connects to a standard 24-pin main power socket and provides the necessary CPU and peripheral cables for a typical build.

Will the Zero RPM fan mode stay silent when paired with an older CPU that idles at higher wattage?

Zero RPM operates at low and medium loads; if the legacy processor draws enough power to exceed the fan-off threshold, the fan will spin up automatically.

How can I confirm the 80 PLUS Gold efficiency is active after installation?

The PSU will run cooler and draw less wall power at the same load compared with a non-certified unit, and the fan will remain off longer under light workloads.

Also in this aisle

People compared these

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