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Rectangular metal ATX power supply with single fan and 20+4 pin connector

Replace Power

Replace Power RPSU-4g456 420W ATX power supply

SKU CH-5TM5-R1J2R MPN RPSU-4g456

420W ATX power supply with reduced depth, 20+4 pin adapter, SATA connectors and full protection suite for legacy Dell and HP systems

  • TypeATX
  • Fans1
  • Weight1.5
  • 420 W output powers legacy Dell Smartstep systems
  • 20+4 pin ATX connector fits both 20 and 24 pin motherboards
  • 9 inch depth allows installation in compact cases
  • 110–260 V AC switchable input works worldwide
  • Over current, over power, over voltage and short circuit protection safeguards components

Direct replacement for legacy Dell and HP systems

The Replace Power RPSU-4g456 is a 420W ATX power supply designed to replace original units in older Dell Smartstep and HP desktops. It matches the 20+4 pin ATX connector so it fits both 20-pin and 24-pin motherboards. Reduced depth improves fit in compact chassis where space is limited. The unit ships new with a single cooling fan.

Practical limits of the ATX interface

The supply delivers +3.3V at 11A, +5V at 12A and dual +12V rails at 8A each, with -12V at .3A and +5VSB at 2A. Over-current, over-power, over-voltage and short-circuit protection are built in. Input voltage is switchable between 110 and 260 volts AC at 50 or 60 Hz. Operating temperature range is 0 to 50 Celsius at full load. Three SATA, three LP4 and one floppy connector cover legacy drive configurations.

Upgrade path from lower-wattage OEM units

This unit replaces OEM supplies rated at 250W or below, adding headroom for added drives or a modest graphics card. The jump is worth it when the original unit fails, when system instability points to power limits or when a rebuild needs standard ATX connectors. It does not suit builds that require higher 12V current or modern GPU power connectors beyond the P4 4-pin.

Pluspunten

  • 420 W output powers legacy Dell Smartstep systems
  • 20+4 pin ATX connector fits both 20 and 24 pin motherboards
  • 9 inch depth allows installation in compact cases
  • 110–260 V AC switchable input works worldwide
  • Over current, over power, over voltage and short circuit protection safeguards components

Specificaties

BrandReplace Power?
ModelRPSU-4g456
TypeATX
Fans1
Weight1.5

Vragen over dit artikel

Which capacity should I choose for a Dell Smartstep 100d or 150d replacement?

The unit is a single 420 watt model; there are no alternative capacities listed, so select this one for the Smartstep 100d, 150d and the other part numbers shown.

What does the 420 watt rating mean once the supply is installed in my PC?

It indicates the total continuous power the unit can deliver across all rails, with +3.3V at 11A, +5V at 12A and two +12V rails each rated at 8A.

What connectors does the ATX 20+4 pin interface provide and what limits apply?

The 20+4 pin plug works with both 20 pin and 24 pin motherboards, and the supply also includes one P4 12V 4-pin, three SATA 15-pin, three LP4 4-pin and one floppy 4-pin connector.

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