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Rectangular metal ATX power supply unit with black matte finish and cooling fan grille

KHACHIMO

KHACHIMO COLDWATT 650W Gold ATX power supply

SKU CH-ZWH7-FNPVB

An ATX power supply delivering 650 W with 80 PLUS Gold efficiency, zero-RPM fan mode and Modern Standby support for fast sleep wake and quiet low-load operation

  • TypeATX
  • Fast wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Fan stops completely at low and medium loads
  • LLC resonant plus DC-to-DC topology delivers clean power
  • 650 W ATX unit built for modern sleep states

650W Gold ATX Power Supply

The KHACHIMO COLDWATT 650W is an ATX power supply built for desktop PCs that need efficient, quiet delivery. Its 80 PLUS Gold certification means less waste heat and lower running costs. Modern Standby support gives extremely fast wake-from-sleep times and better low-load efficiency. Resonant LLC topology with DC-to-DC conversion provides clean, consistent power and reduces coil whine.

ATX Form Factor With Zero RPM Fan Mode

The unit fits standard ATX cases and uses a fan that switches off entirely at low and medium loads for near-silent operation. DC-to-DC conversion enables more energy-efficient sleep states while maintaining stable voltage rails. Builders who need a power supply that stays quiet during everyday workloads will benefit from the zero-RPM behaviour. Systems requiring specialised form factors or external fan control are not addressed by this design.

650 Watt Continuous Output With Gold Efficiency

The 650W rating delivers enough headroom for mainstream CPUs and single mid-range graphics cards under full load. Gold-level efficiency keeps temperatures lower and reduces acoustic output compared with lower-rated units. Builds with multiple high-end GPUs, extreme overclocking or very high peak power demands will exceed the available capacity. The supply covers typical gaming and workstation configurations without needing a larger unit.

Highlights

  • Fast wake-from-sleep with Modern Standby support
  • 80 PLUS Gold efficiency cuts power draw and heat
  • Fan stops completely at low and medium loads
  • LLC resonant plus DC-to-DC topology delivers clean power
  • 650 W ATX unit built for modern sleep states

Specifications

TypeATX

Questions about this item

What happens to the fan when the PSU runs at low and medium loads all day?

The Zero RPM Fan Mode keeps the fan completely stopped until the load rises above the medium threshold, giving near-silent operation during typical desktop use.

How much heat and noise should I expect from this 650 W unit under continuous full load?

80 PLUS Gold certification means high efficiency, so less waste heat and lower fan speeds even when the supply is delivering its full rated output.

Which motherboard power connectors must my board already have for this ATX supply to work?

A standard 24-pin ATX connector plus the required 4+4-pin or 8-pin CPU power connector are needed; the unit follows the regular ATX pinout.

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