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

Replace Power

Replace Power RPMPS3420-1 400w ATX power supply

SKU CH-7JSB-W2MTK MPN RPMPS3420-1

A 400w ATX power supply with a 20+4 pin connector and single 12v rail replaces 250w units in Dell Optiplex GX270 and GX280 towers

  • TypeATX
  • Fans1
  • Weight0.1
  • Replaces Dell Optiplex GX270 and GX280 tower PSUs directly
  • 20+4 pin connector fits both 20-pin and 24-pin motherboards
  • 250 W output covers typical Optiplex workloads
  • Single 12 V rail with over-voltage protection
  • Switchable 115/230 V input for worldwide use

Dell Optiplex GX270 and GX280 replacement

This 400w ATX unit is built as a direct replacement for Dell Optiplex GX270 Tower and GX280 Tower systems. It delivers a 250w main output through a single rail design with over-voltage protection. The 20+4 pin main connector fits both 20-pin and 24-pin motherboard sockets. Input voltage covers 115 / 230 V at 50/60 Hz.

Small-form-factor Dell tower owners needing

The supply matches the original connector layout and power rating for those specific Optiplex towers. Builders working with standard ATX cases, discrete graphics cards, or higher-wattage requirements should look elsewhere because the unit is sized for the original OEM chassis and load profile.

20+4 pin main connector for 20-pin and 24-pin boards

This single connector specification determines whether the unit will plug into the target motherboard without adapters. The same harness also serves the original Dell wiring, so compatibility hinges on that pin arrangement.

Highlights

  • Replaces Dell Optiplex GX270 and GX280 tower PSUs directly
  • 20+4 pin connector fits both 20-pin and 24-pin motherboards
  • 250 W output covers typical Optiplex workloads
  • Single 12 V rail with over-voltage protection
  • Switchable 115/230 V input for worldwide use

Specifications

BrandReplace Power
ModelRPMPS3420-1
TypeATX
Fans1
Weight0.1

Questions about this item

Will the RPMPS3420-1 fit a Dell Optiplex GX270 or GX280 tower case?

The unit is listed as a direct replacement for Dell Optiplex GX270 Tower and Optiplex GX280 Tower chassis, matching the original mounting points and form factor.

How do I connect the 20+4 pin motherboard cable if my board only has a 20-pin socket?

The 20+4 pin connector splits so the extra 4 pins detach; plug the 20-pin portion into the motherboard socket and leave the 4-pin section unconnected.

Does the fan or any other part need periodic replacement on this 250 W unit?

The power supply has a single internal fan; no user-serviceable parts are identified, so the entire module is replaced if the fan fails or output degrades.

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