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
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

  • 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.

Highlights

  • 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

Specifications

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.

Also in this aisle

People compared these

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