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Rectangular silver ATX power supply unit with single fan visible on one side, black grille and rear power socket

Replace Power

Replace Power RPSU-ats100-300 300W ATX power supply

SKU CH-D6F8-25KE8 MPN RPSU-ats100-300

A 300W ATX power supply with a 20+4 pin adapter, SATA connectors and reduced depth for legacy HP Bestec models

  • Fan configuration1
  • Product typeATX
  • Product weight1.5
  • Replaces multiple legacy HP Bestec units with 300W output
  • 20+4 pin adapter supports 20 and 24 pin motherboards
  • Reduced 5.9 depth fits compact ATX cases
  • Over current, over power, over voltage and short circuit protection
  • 110-260V AC switchable input for worldwide use

Direct HP Bestec Replacement

This 300W ATX unit replaces legacy Bestec models such as ATS-100, ATS-150 and ATX-1956 series. It fits HP systems that originally shipped with those power supplies and provides a straight swap without adapter cables. The built-in 20+4 pin connector supports both 20 and 24 pin motherboards. Over-current, over-voltage and short-circuit protection are included.

Compatibility Check Points

Verify that your chassis can accept the reduced depth of 5.9 inches width by 3.4 inches height. Confirm the motherboard uses a standard ATX 20 or 24 pin main connector and a P4 12V 4-pin auxiliary connector. Ensure the required drive connectors match the three SATA, three LP4 and one floppy leads provided. The input voltage switch must be set to your local 110 or 260 V AC supply.

Upgrade From Lower-Watt Legacy Units

This supply moves you from 100W, 150W or 250W legacy units to a 300W rating with dual 12V rails rated at 8A each. The jump is worth it when the original unit has failed or when added drives and expansion cards exceed the old capacity. It is not for builders who need more SATA ports than three or who require PCIe power connectors for discrete graphics cards.

How it compares

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

Price $58.99
Cheaper than about 86% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Brand nameReplace Power?
Model nameRPSU-ats100-300
Product typeATX
More details
Fan configuration1

Questions about this item

What cables and connectors come with the Replace Power RPSU-ats100-300, and what must be sourced separately?

The unit ships with a 20+4 pin ATX connector, one P4 12V 4-pin, three SATA 15-pin, three LP4 4-pin and one floppy 4-pin. No extra cables are included.

How do I choose the right version of this 300 W ATX supply for my HP system?

Match the original HP part number — ATS-100, ATS-150, ATX-1953D, ATX-1956D, ATX-1956-B1, ATX-1956F, ATX-1951D, ATX-250-12Z, ATX-250-12E, ATX-300-12Z, ATX-300-12E, 5188-2625, DPS-300AB or HP-D3057F3R.

What does the 300 W rating actually deliver across the rails inside a working PC?

The combined output provides +3.3 V at 11 A, +5 V at 12 A, two +12 V rails each at 8 A, -12 V at 0.3 A and +5 VSB at 2 A.

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