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Silver ATX power supply, compact depth, single fan, 20+4 pin connector visible

Replace Power

Replace Power RPSU-450AA 400 W ATX power supply

SKU CH-M5B5-7STED MPN RPSU-450AA

400 W ATX replacement supply with reduced depth for legacy HP Delta units, offering 20+4 pin, P4, three SATA, three LP4 and one floppy connector.

  • TypeATX
  • Fans1
  • Weight1.5
  • Delivers 400 W output for legacy HP Delta systems
  • 20+4 pin ATX connector fits both 24 and 20 pin motherboards
  • Reduced 4 inch depth eases installation in compact cases
  • 110–260 V AC switchable input works worldwide
  • Over current, over power, over voltage and short circuit protection included

Replacement for HP Delta GPS-450AA-100

This ATX power supply replaces several legacy HP Delta units including the GPS-450AA-100 A and DPS-350AB-8A. It delivers 400 W of continuous power from a reduced-depth chassis that fits standard ATX mounting points. The 20+4 pin main connector supports both 24-pin and 20-pin motherboards. A single fan provides cooling across the 1.5 kg unit.

Built-in adapter and protection suite

The integrated 20+4 pin adapter removes the need for a separate converter when moving between 24-pin and 20-pin boards. Over-current, over-power, over-voltage and short-circuit protection circuits guard connected components. A 110-260 V AC switchable input lets the unit operate on global mains voltages without manual reconfiguration.

Connectors and headroom

Three SATA 15-pin, three LP4 4-pin and one floppy 4-pin connector cover legacy drives and peripherals. A single P4 12 V 4-pin header feeds the CPU. The 400 W rating offers headroom for mid-range graphics cards and multiple drives, while the reduced depth eases cable routing in compact cases. Systems needing dual EPS connectors or higher 12 V current will require a larger unit.

Highlights

  • Delivers 400 W output for legacy HP Delta systems
  • 20+4 pin ATX connector fits both 24 and 20 pin motherboards
  • Reduced 4 inch depth eases installation in compact cases
  • 110–260 V AC switchable input works worldwide
  • Over current, over power, over voltage and short circuit protection included

Specifications

BrandReplace Power
ModelRPSU-450AA
TypeATX
Fans1
Weight1.5

Questions about this item

Does the built-in fan need periodic cleaning or replacement to keep the RPSU-450AA running reliably?

The single internal fan draws dust over time; cleaning it with compressed air every few months maintains airflow and prevents thermal stress on the 400 W unit.

What protection limit activates first when the RPSU-450AA is pushed continuously near its 400 W rating?

Over-power protection triggers before sustained loads exceed the rated output, shutting the supply down to prevent damage.

How much heat and noise does the RPSU-450AA produce when running all day at typical load?

Low ripple and noise spec combined with the reduced-depth chassis keep temperatures and acoustic output within normal ATX expectations for a 400 W supply.

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