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Rectangular black ATX power supply unit with cooling fan and cable bundle

KHACHIMO

KHACHIMO HK650-11PEP 550W ATX Power Supply

SKU CH-1WCT-M2Y59

Delivers 550 W of 80 PLUS Gold ATX power with Modern Standby support, zero-RPM fan mode and resonant LLC plus DC-to-DC topology for clean, quiet output

  • Product typeATX
  • Fast wake from sleep with Modern Standby support
  • High efficiency cuts power draw and heat with 80 PLUS Gold
  • Silent operation at low loads via Zero RPM fan mode
  • Clean, stable power delivery through resonant LLC and DC-to-DC
  • 550 W continuous output for reliable system performance

550 W ATX Power Supply

This KHACHIMO HK650-11PEP unit delivers 550 W of continuous power in a standard ATX form factor. It carries 80 PLUS Gold certification for high efficiency and lower running costs. Modern Standby compatibility enables extremely fast wake-from-sleep times and improved low-load efficiency. The resonant LLC topology with DC-to-DC conversion provides clean, consistent power and reduces coil whine.

Builders who value silent operation

The Zero RPM fan mode stops the cooling fan entirely at low and medium loads for near-silent running. Systems that require sustained loads above 550 W should look at a higher-capacity unit. Builds needing non-ATX form factors or different connector layouts will need an alternative design.

Standard ATX installation with semi-passive cooling

Mounting uses the regular ATX screw pattern and the unit connects via typical motherboard and peripheral cables. The Zero RPM mode engages automatically, so no software setup is required for silent low-load operation. Coil whine is minimised by the LLC resonant topology, though fan noise will appear once loads exceed the semi-passive threshold.

How it compares

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

Price $570.99
Pricier than about 90% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeATX

Questions about this item

Does my motherboard need a 24-pin ATX connector to work with this 550W unit?

Yes, this is an ATX-type supply so it requires a standard 24-pin motherboard connector plus the usual CPU and peripheral cables.

Will the Zero RPM Fan Mode still operate if I keep an older graphics card that draws more power at idle?

The fan stops at low and medium loads; a higher-idle GPU may keep the load above the zero-RPM threshold so the fan would stay on.

How can I confirm the 80 PLUS Gold efficiency is active after installation?

Monitor AC input versus DC output with a power meter; at typical loads you should see efficiency above 80 % and the fan should remain off during light use.

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