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Compact 1U Flex ATX gold power supply with 4-pin and 80 PLUS label

KHACHIMO

KHACHIMO HJ-450WA 1U Flex ATX 300W 450W Gold power supply

SKU CH-AESW-EX7WW

A 1U Flex ATX unit rated 300 W continuous with 450 W peak and 80 PLUS Gold efficiency for compact builds

  • Product typeATX
  • Fast wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Fan stops at low loads for silent operation
  • Resonant LLC topology delivers clean, stable power
  • 300 W continuous, 450 W peak for compact builds

Compact 1U Flex ATX power supply

The KHACHIMO HJ-450WA fits 1U rackmount chassis, HTPC cases and small NAS builds that require a Flex ATX form factor. It delivers a continuous 300 W with a 450 W peak rating, making it suitable for compact systems that need reliable power in a shallow enclosure.

Practical limits of the Flex ATX standard

The reduced dimensions restrict cable routing space and limit the number of connectors compared with full-size ATX units. Builders must verify that their case and backplane provide the exact mounting pattern and airflow clearance the 1U height demands.

Replaces larger or lower-efficiency Flex units

Swapping an older bronze-rated or non-Modern Standby supply eliminates coil whine, enables zero-RPM fan operation at low loads and supports faster wake-from-sleep. The upgrade is worthwhile when the existing unit cannot sustain 300 W continuously or lacks 80 PLUS Gold efficiency.

How it compares

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

Price $97.99
Cheaper than about 68% of the 10,869 comparable items (median $142.99).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Product typeATX

Questions about this item

Which capacity should I choose between the rated 300W and peak 450W?

The unit delivers a continuous 300W and can briefly reach 450W; size the build so typical draw stays near 300W for reliable operation.

What does the 80 PLUS Gold rating mean once the PSU is installed?

It certifies high efficiency across typical loads, reducing power draw, heat output and fan noise compared with lower-rated units.

What interface does the ATX design use and what does it limit in practice?

Standard ATX connectors restrict the PSU to motherboards and chassis that accept the 24-pin main plug and matching CPU/PCIe cables.

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