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Silver metal ATX power supply unit with single fan and 20+4 pin connector visible

Replace Power

Replace Power RPSU-DPS-300AB 420W ATX power supply

SKU CH-RJVC-X2VR4 MPN RPSU-DPS-300AB

A 420W ATX power supply with reduced depth and a 20+4 pin adapter replaces legacy units in HP Compaq and eMachine systems

  • TypeATX
  • Fans1
  • Weight1.5
  • 420 W output powers legacy HP and eMachine systems
  • 20+4 pin ATX connector fits both 20 and 24 pin motherboards
  • Reduced 5.9 in depth improves case compatibility
  • 110 to 260 V AC switchable input works worldwide
  • Over current, over power, over voltage and short circuit protection safeguards components

Replacement ATX power supply

The Replace Power RPSU-DPS-300AB is a 420W ATX unit designed to replace legacy power supplies in compatible HP, Compaq, eMachine and Delta systems. It fits builds that require a standard ATX form factor with a reduced depth for tighter chassis clearance. The unit includes a built-in 20+4 pin adapter that supports both 20-pin and 24-pin motherboard connections. It targets users restoring or upgrading older office or home PCs.

Thermals noise and power draw

A single fan cools the unit across an operating range of 0 to 50 Celsius at full load. The supply accepts 110 to 260V AC input via a switchable selector and runs on 50 or 60 Hz mains frequency. Protection circuits cover over current, over power, over voltage and short circuit events. Output rails deliver 3.3V at 11A, 5V at 12A, two 12V rails at 8A each, -12V at .3A and 5V standby at 2A.

Upgrade path and fit

This model replaces numerous older 250W and 300W units including Bestec ATX-250-12E, ATX-300-12E and Delta DPS-300AB variants. The jump is worth it when the original supply has failed or when a system needs the higher 420W rating and additional connectors such as three SATA 15-pin, three LP4 4-pin and one floppy 4-pin. Builders needing more SATA ports or a different form factor should look elsewhere.

Highlights

  • 420 W output powers legacy HP and eMachine systems
  • 20+4 pin ATX connector fits both 20 and 24 pin motherboards
  • Reduced 5.9 in depth improves case compatibility
  • 110 to 260 V AC switchable input works worldwide
  • Over current, over power, over voltage and short circuit protection safeguards components

Specifications

BrandReplace Power
ModelRPSU-DPS-300AB
TypeATX
Fans1
Weight1.5

Questions about this item

How is the 20+4 pin ATX connector installed, and what step do people get wrong?

Plug the single 20+4 pin block into the motherboard; the split section separates for 20-pin boards, so do not force the extra four pins into a 20-pin socket.

What maintenance or replacement will the unit need later?

The internal fan is the only moving part; clean dust from its intake and exhaust vents periodically, and replace the whole supply if the fan becomes noisy or stops spinning.

Which limit appears first during sustained full-load operation?

The +12 V rails are each rated at 8 A, so the 12 V output capacity reaches its ceiling before the 3.3 V or 5 V rails do.

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