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Dell JH994 305W ATX power supply unit with single fan

DELL

DELL JH994 305W Power Supply Optiplex GX745 330/775 T105

SKU CH-J5Q1-YAW8P

A 305 watt ATX power supply with one fan for Optiplex GX745 330/775 T105 systems

  • Reliable 305 Watt output for Optiplex GX745 330/775 systems
  • Single fan design delivers efficient cooling for continuous operation
  • ATX form factor ensures direct fit in compatible Dell chassis
  • Genuine Dell JH994 part number guarantees OEM compatibility
  • New condition unit ready for immediate installation in T105 configurations

Compatible replacement for Optiplex GX745 330/775

This 305 Watt ATX power supply carries Dell part number JH994 and is built for the Optiplex GX745 330 and 775 small-form-factor desktops. It delivers the factory-rated output through a single cooling fan. The unit is supplied new and matches the original electrical and mechanical specification.

Direct swap for a failed or noisy original unit

Replacing the stock supply with this JH994 module restores the 305 Watt rating without adapter cables or case modifications. The upgrade is worth it when the existing unit shows voltage drift, fan bearing noise or complete loss of power. No higher-wattage alternative is offered for this chassis.

Verify the Optiplex model

Confirm the service tag reads GX745 330 or GX745 775; other Optiplex generations use different connectors and mounting tabs. Ensure the current supply is the 305 Watt ATX version labelled T105 or JH994. The proprietary main-power plug will not fit standard ATX motherboards.

Highlights

  • Reliable 305 Watt output for Optiplex GX745 330/775 systems
  • Single fan design delivers efficient cooling for continuous operation
  • ATX form factor ensures direct fit in compatible Dell chassis
  • Genuine Dell JH994 part number guarantees OEM compatibility
  • New condition unit ready for immediate installation in T105 configurations

Specifications

BrandDell

Questions about this item

What form factor does the JH994 305W power supply use to fit the Optiplex GX745 chassis?

The JH994 uses an ATX form factor designed for the Optiplex GX745 330 and 775 T105 chassis. It occupies the standard PSU bay and aligns with the rear mounting points.

Which step is most often missed when installing the Dell JH994 305W unit into the Optiplex GX745?

After sliding the JH994 into the bay, the single retention screw at the rear must be tightened before connecting the mainboard power cables. Skipping the screw leaves the unit loose and can disconnect under vibration.

How do I know when the JH994 305W power supply fan needs cleaning or the unit needs replacement?

Listen for rising fan noise or watch for unexpected shutdowns under load. The single fan draws air through the rear grille; dust buildup reduces airflow and triggers thermal protection on the 305W supply.

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