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

Replace Power

Replace Power RPMPS3420-8 power supply 400w ATX

SKU CH-AFYB-MEZHS MPN RPMPS3420-8

A 400 W ATX power supply with a 20+4 pin connector and single-rail design, compatible with Dell Vostro 200 and Studio 540 systems

  • TypeATX
  • Fans1
  • Weight0.1
  • 400 W output keeps Dell Vostro 200 and Studio 540 running reliably
  • Single-rail +12 V at 16 A delivers steady power to CPU and GPU
  • 20+4 pin plus 12 V connector fits existing motherboard without adapters
  • Switchable 115/230 V input works on mains worldwide
  • Hold-up time of 17 ms bridges brief power dips safely

Replacement PSU for Dell Vostro 200 and Studio 540

This 400 w ATX power supply replaces the Dell hp-p2507f3p unit used in Vostro 200 and Studio 540 desktops. It delivers a single-rail design with 3.3 V at 13 A, 5 V at 13 A, 12 V at 16 A, -12 V at 0.8 A, -5 V at 0.5 A and 5 VSB at 2.5 A. A 20+4 pin main connector and a 12 V connector are provided. Input accepts 115 or 230 V at 50 or 60 Hz.

Fits proprietary Dell chassis

The unit mounts in the original Dell case and uses the same 20+4 pin motherboard plug plus a dedicated 12 V connector. One internal fan handles cooling. Rise time is under 70 ms and hold-up time is at least 17 ms at nominal input. No extra cables or adapters are required for the supported models.

Suits owners repairing a Vostro 200 or Studio 540

Builders needing higher wattage, modular cabling or modern standby support should look elsewhere. Systems requiring PCIe power connectors for discrete graphics cards are not supported by this replacement unit.

Highlights

  • 400 W output keeps Dell Vostro 200 and Studio 540 running reliably
  • Single-rail +12 V at 16 A delivers steady power to CPU and GPU
  • 20+4 pin plus 12 V connector fits existing motherboard without adapters
  • Switchable 115/230 V input works on mains worldwide
  • Hold-up time of 17 ms bridges brief power dips safely

Specifications

BrandReplace Power
ModelRPMPS3420-8
TypeATX
Fans1
Weight0.1

Questions about this item

How long can the 12 V rail sustain its 16 A rating before protection trips?

The single-rail design delivers +12 V at 16 A continuously; over-current protection engages only if that limit is exceeded.

What noise and heat should I expect when the unit runs at full load all day?

One internal fan cools the 400 W supply; at sustained load the fan speed rises to maintain safe temperatures.

Which Dell chassis and motherboards already have the matching 20+4-pin and 12 V connectors?

Direct replacement for Dell hp-p2507f3p in Vostro 200 400 and Studio 540 systems.

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