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Compact silver 1U flex ATX power supply with rear fan grille and modular cable sockets

KHACHIMO

KHACHIMO FSP ITX HTPC FLEX 1U K39 850W Power Supply

SKU CH-BH38-ZVRN3

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

  • Product typeATX
  • Modern Standby compatibility for fast wake-from-sleep and better low-load efficiency
  • 80 PLUS Gold certification for high efficiency, lower power use and cooler temps
  • Zero RPM fan mode stops the fan at low and medium loads for near-silent operation
  • Resonant LLC topology with DC-to-DC conversion delivers clean power and reduces coil whine
  • Flex 1U K39 form factor with 850 W output fits compact ITX and HTPC builds

Compact 1U FLEX form factor

This KHACHIMO FSP unit delivers 850W in a 1U FLEX ATX enclosure suited to small-form-factor and HTPC builds where vertical space is tight. It provides high-output power without demanding a full-height PSU bay, making it a practical choice for slimline chassis.

For space-constrained builds, not multi-GPU rigs

Builders assembling compact workstations or quiet living-room PCs will benefit from the Gold-rated efficiency and Zero RPM fan mode that keeps noise low at typical loads. Systems that require multiple high-wattage graphics cards or redundant power inputs should look at larger redundant or higher-capacity designs.

Fits 1U FLEX bays and frees internal volume

The 1U FLEX dimensions allow installation in narrow server-style or HTPC cases, leaving more room for storage drives or airflow paths. Modern Standby support enables rapid wake-from-sleep, while the LLC resonant topology with DC-to-DC conversion delivers stable rails for sensitive components.

How it compares

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

Price $311.99
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

What motherboard power connectors does the K39 850W require to work?

It uses a standard ATX connector set, so a motherboard with a 24-pin main socket and the matching CPU power header will accept it.

Will the 850W FSP unit fit in a case that previously held a regular FLEX 1U supply?

Yes, the K39 shares the 1U FLEX form factor, so it drops into the same mounting holes and bracket space as the older unit.

How can I verify the Zero RPM fan mode is active after I build the system?

With the PC idling, listen for the PSU fan; if it remains still while the system is on, the mode is working as intended.

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