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Compact silver 1U power supply unit with rear fan grille and modular cable connectors

KHACHIMO

KHACHIMO FSP FLEX 1U 350W Switching Power Supply FSP350-70LQ

SKU CH-217Y-PA4GE

A 350W Flex ATX power supply with 80 PLUS Gold efficiency, Modern Standby support, Zero RPM fan mode and resonant LLC topology with DC-to-DC conversion

  • Product typeATX
  • Modern Standby support gives near-instant wake from sleep
  • 80 PLUS Gold efficiency reduces power draw and heat output
  • Zero RPM fan mode stops the fan at low loads for silent running
  • Resonant LLC topology with DC-to-DC conversion delivers clean, stable power
  • 350 W ATX output in a compact 1U form factor for dense builds

FSP FLEX 1U 350W PSU

The KHACHIMO FSP FLEX 1U 350W is a compact ATX power supply built for small-form-factor systems. It fits 1U rackmount chassis and slim desktop cases where standard PSUs cannot be installed. The 350W output supports mainstream CPUs and mid-range graphics cards in space-constrained builds. It targets system integrators and enthusiasts assembling high-density workstations or home servers.

80 PLUS Gold with Zero RPM Fan

Gold-certified efficiency reduces waste heat and lowers operating costs across typical loads. The resonant LLC topology with DC-to-DC conversion delivers tight voltage regulation and minimises coil whine. A Zero RPM fan mode stops the fan completely at low and medium loads for silent running. Modern Standby compatibility enables near-instant wake from sleep states.

Upgrade from noisy or inefficient flex units

This unit replaces older flex ATX power supplies that lack Gold certification or semi-passive cooling. The jump is worthwhile when building a quiet 1U server, a compact media PC, or any system where low idle noise and fast sleep recovery matter. It is not suited for high-wattage multi-GPU configurations or full-size towers requiring standard ATX dimensions.

How it compares

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

Price $133.99
Typical for this category: the median of 10,869 items is $142.99.

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Specifications

Product
Product typeATX

Questions about this item

What does the 80 PLUS Gold certification mean for the FSP350-70LQ in practice?

The certification confirms the power supply meets high efficiency standards at typical loads, reducing power draw, heat output and fan noise compared with lower-rated units.

What physical space and mounting pattern does this 1U FLEX supply require?

It fits a standard 1U rack or slim chassis using the FLEX form factor and the usual four-hole ATX mounting pattern.

How do I enable the Zero RPM fan mode on the FSP350-70LQ?

The mode activates automatically at low and medium loads; no BIOS or software setting is needed — just ensure the unit is not overloaded.

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