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Silver rectangular Flex ATX power supply unit with black fan grille and label sticker

KHACHIMO

KHACHIMO 850W Flex ATX Power Supply FSP850-60LGH

SKU CH-3HYM-2ZZFZ

An 850 W Flex ATX power supply with 80 PLUS Gold efficiency, Zero RPM fan mode and Modern Standby support for compact ITX and HTPC builds

  • Product typeATX
  • Modern Standby support gives faster wake times
  • 80 PLUS Gold certification cuts power draw and heat
  • Zero RPM mode stops the fan at low loads for silence
  • Resonant LLC with DC-to-DC delivers clean power and reduces coil whine
  • 850 W output fits FSP ITX, HTPC and 1U K39 builds

Compact 850 W Flex ATX power for small builds

This KHACHIMO Flex ATX unit delivers 850 W in the narrow form factor used by many ITX, HTPC and 1U chassis. It targets builders who need full ATX output from a supply that fits tight spaces and modern sleep states.

80 PLUS Gold efficiency with Zero RPM fan

Gold-rated efficiency cuts waste heat and keeps component temperatures lower during normal loads. The Zero RPM mode stops the fan completely at low and medium power draw, while the resonant LLC topology with DC-to-DC conversion reduces coil whine and supports efficient sleep states.

Fits Flex ATX bays and Modern Standby motherboards

The supply mounts in standard Flex ATX cut-outs and works with motherboards that implement Modern Standby for near-instant wake. Builders needing a larger ATX footprint or redundant server features should look elsewhere.

How it compares

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

Price $317.99
Pricier than about 79% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeATX

Questions about this item

How do I mount this Flex ATX unit in a standard ITX or 1U chassis and which screw alignment do installers often miss?

Align the unit so the 39 mm width matches the chassis rails and use all four corner mounting holes; the step most people miss is forgetting the rear support bracket that prevents the AC inlet from flexing under cable strain.

What component will need replacement first and how does the Zero RPM mode affect its lifespan?

The cooling fan is the only moving part; because Zero RPM keeps it off at low and medium loads, bearing wear is significantly reduced, so replacement is rarely needed within the unit's normal service life.

At what sustained load does the 80 PLUS Gold efficiency curve stop improving and thermal limits become the bottleneck?

Efficiency peaks around 50 % of the 850 W rating; beyond that point, rising internal temperatures become the limiting factor before the protection circuits engage.

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