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Replace Power RPMPS3420-9 400 W ATX power supply, metal case, single fan, 20+4 pin connector

Replace Power

Replace Power RPMPS3420-9 400 W ATX power supply

SKU CH-ETKM-V1K7B MPN RPMPS3420-9

400 W ATX unit with 20+4-pin motherboard connector and single 12 V rail rated at 16 A

  • Fan configuration1
  • Product typeATX
  • Product weight0.1
  • Direct replacement for HP Pavilion 7955, 7965, 7970 systems
  • 20+4 pin connector fits both 20-pin and 24-pin motherboard sockets
  • 400 W output with +12 V rail rated at 16 A
  • Single-rail design with over-voltage protection on input
  • Operates on 115 V or 230 V at 50/60 Hz

Replacement PSU for HP Pavilion 7955 7965 7970

This 400 W ATX power supply replaces the original unit in HP Pavilion 7955, 7965 and 7970 desktops. It also fits most standard motherboards thanks to its 20+4 pin main connector. The single-rail design delivers 16 A on the +12 V line and 13 A each on +3.3 V and +5 V.

20+4 pin main connector

The 20+4 pin motherboard connector works with both 20-pin and 24-pin sockets, removing the need for an adapter when upgrading older boards. This single specification decides whether the unit will power a given system without extra cables.

Owners of HP Pavilion 7955 7965 7970

Suitable for anyone restoring those models or building a basic ATX system that draws within the rated rails. Builders who need more +12 V current, modular cables or active PFC should look at something else.

How it compares

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

Price $64.99
Cheaper than about 82% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Brand nameReplace Power
Model nameRPMPS3420-9
Product typeATX
More details
Fan configuration1

Questions about this item

What does the 400 W rating actually deliver to a running system?

The unit supplies up to 400 W total, with the +12 V rail limited to 16 A, +3.3 V and +5 V each to 13 A, -12 V to 0.8 A, -5 V to 0.5 A and +5 V standby to 2.5 A.

What connectors does the 20+4 pin ATX plug support and what limits apply?

The 20+4 pin main connector fits both 20-pin and 24-pin motherboard sockets, and the single-rail design shares the 400 W across all outputs.

What mounting points and clearance does this PSU need inside a case?

Standard ATX dimensions allow it to bolt into any ATX-compatible chassis using the four rear mounting holes.

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