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Replace Power RPMPS3420-6 ATX power supply unit with single fan and 20+4 pin connector

Replace Power

Replace Power RPMPS3420-6 power supply ATX 20+4Pin 115/230V

SKU CH-4CT4-2E1BN MPN RPMPS3420-6

ATX power supply with a 20+4 pin connector for Dell Dimension 4700 and 8400 systems, supporting 115/230 V input

  • Fan configuration1
  • Product typeATX
  • Product weight0.1
  • Direct replacement for Dell Dimension 4700 and 8400 models
  • 20+4 pin connector fits both 20-pin and 24-pin motherboard sockets
  • Single-rail design delivers +12V at 16A for stable component power
  • Operates on 115V or 230V input at 50/60Hz for global use
  • Built-in over-voltage protection safeguards connected hardware

Replacement PSU for Dell Dimension 4700 8400

The Replace Power RPMPS3420-6 is an ATX power supply built as a direct replacement for the Dell Dimension 4700 and 8400 systems using part numbers K8956 and P8401. It provides a 20+4 pin main connector that fits both 20-pin and 24-pin motherboard sockets. The unit operates on 115 or 230 V input at 50/60 Hz and includes a single fan for cooling. It suits owners of those legacy Dell desktops who need a new-old-stock power module.

Steady output on a single rail

The supply uses a single rail design with over-voltage protection and delivers +3.3 V at 13 A, +5 V at 13 A, +12 V1 at 16 A, -12 V at 0.8 A, -5 V at 0.5 A and +5 VSB at 2.5 A. Rise time is less than 70 ms and hold-up time is at least 17 ms at nominal input voltage. These figures describe sustained delivery rather than a short peak, so the unit maintains stable rails during continuous operation in the original chassis.

Swaps the original Dell module

This unit replaces the factory Dell power supply when the original fails or shows voltage instability. The jump is worth it when the existing PSU no longer holds the 17 ms hold-up time or when the 20+4 pin connector is needed for a motherboard upgrade inside the same case. It is not for builders who need higher wattage than the listed rail currents provide or who require modular cabling for a custom build.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $60.99
Cheaper than about 85% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Brand nameReplace Power
Model nameRPMPS3420-6
Product typeATX
More details
Fan configuration1

Questions about this item

How much heat and power draw should I expect from the single fan running continuously?

The unit has one fan and draws 115 or 230 V at 50/60 Hz; hold-up time is 17 ms minimum at nominal input voltage.

What existing connectors must my motherboard already provide for this supply to work?

The supply uses a 20+4 pin main connector and a +12 V rail, so your board needs a 20-pin or 24-pin ATX socket.

Will the +12 V rail rated at 16 A support the older Dell Dimension 4700 and 8400 systems I still use?

Yes, the +12 V1 rail delivers 16 A and the unit is listed as a direct replacement for Dell part K8956 and P8401 in those models.

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