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Silver rectangular ATX power supply unit, single fan, compact depth, 1.5 kg

Replace Power

Replace Power RPSU-ats100 420W ATX Power Supply

SKU CH-VK3F-YYSG3 MPN RPSU-ats100

ATX power supply replaces legacy HP Bestec units with 420 W output and reduced depth for broad compatibility

  • Fan configuration1
  • Product typeATX
  • Product weight1.5
  • 420 W output replaces legacy Bestec units without rewiring
  • 20+4 pin ATX connector fits both 20-pin and 24-pin motherboards
  • Reduced 5.9" depth slides into tight chassis where standard PSUs will not
  • 110-260 V AC switchable input works worldwide without an external adapter
  • Over-current, over-voltage, over-power and short-circuit protection guards connected hardware

Replacement PSU for legacy HP Bestec units

This 420 watt ATX supply replaces several older Bestec models including ATS-100, ATS-150 and ATX-1956 series units. A built-in 20+4 pin adapter supports both 24 and 20 pin motherboards. Reduced depth improves fit in compact chassis. Single fan cooling handles the rated load.

Sustained-load behaviour with protection circuits

Over current, over power, over voltage and short circuit protection activate during prolonged heavy demand. Hold-up time is 17 ms minimum at nominal input. Rise time stays under 70 ms. The 110-260 V AC switchable input operates across 47 to 63 Hz mains frequency. Low ripple and noise are maintained under continuous operation.

Upgrade from 250 W and 300 W legacy units

The 420 W rating provides headroom over original 250 W and 300 W supplies such as ATX-250-12Z, ATX-300-12Z and DPS-300AB. The jump is worthwhile when added drives or expansion cards exceed the original unit's capacity. Connectors include one P4 4 pin, three SATA 15 pin, three LP4 4 pin and one floppy 4 pin.

How it compares

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

Price $62.99
Cheaper than about 83% of the 10,869 comparable items (median $142.99).

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Specifications

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

Questions about this item

How much noise and heat does the 420 W unit produce when it runs all day?

A single fan provides cooling; the supply is Hi-Pot tested for low ripple and noise and includes over-current, over-power, over-voltage and short-circuit protection.

What must I already own for this ATX supply to work in my system?

You need a motherboard with a 20-pin or 24-pin ATX socket, a CPU 4-pin connector, up to three SATA drives, up to three LP4 peripherals and optionally one floppy drive.

Will the RPSU-ats100 fit and power an older HP Bestec ATS-100 or ATX-1956D chassis?

Yes — reduced depth of 5.86" x 3.3" matches legacy HP Bestec ATS-100, ATS-150, ATX-1953D, ATX-1956D, ATX-1956-B1, ATX-1956F and other listed models.

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