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Grey ATX power supply unit with single fan and standard connectors

Replace Power

Replace Power FSP300-ATXPA-6 300W ATX power supply

SKU CH-WMNJ-BR4SW MPN FSP300-ATXPA-6

300 W ATX unit with 24-pin, 4-pin CPU, three SATA, three LP4 and one floppy connector for Dell Optiplex M8802, M8805, M8806, C9962 and 620 systems

  • Fan configuration1
  • Product colorGrey
  • Product typeATX
  • Product weight0.1
  • Direct replacement for Dell Optiplex 8802 8805 8806 C9962 620
  • ATX reduced-depth form factor fits compact chassis
  • 300 W output with +12V1 +12V2 +5V +3.3V -12V +5VSB rails
  • 24-pin ATX plus P4 4-pin three SATA three LP4 one floppy connectors
  • Hi-Pot tested low ripple noise rise time under 70 ms hold-up 17 ms

Replacement ATX Supply for Dell Optiplex

This 300W ATX power supply replaces the original unit in Dell Optiplex M8802, M8805, M8806, C9962 and 620 systems. It delivers +5V, -5V, +12V1, +12V2, +3.3V, -12V and +5V-SB rails from a grey chassis. The reduced-depth form factor fits the tight space inside those chassis. Hi-Pot testing and low ripple specification target stable office workloads.

Connectors and Build Integration

A single 24-pin (20+4) ATX connector powers the motherboard while a P4 4-pin plug feeds the CPU. Three SATA 15-pin connectors, three LP4 4-pin plugs and one floppy 4-pin connector cover legacy and current drives. AC input accepts 110/220V at 47~63Hz so the unit works on global mains without a switch. One internal fan handles airflow in the compact enclosure.

Sustained Load Behaviour

Rise time stays below 70ms and hold-up time is rated at 17ms minimum at nominal input, giving the system a brief ride-through during mains dips. The 60/50Hz frequency rating matches standard line frequency. Continuous output is rated at 300W across the combined rails rather than a short peak figure. Builders needing higher wattage or additional PCIe power for discrete graphics should look elsewhere.

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 nameFSP300-ATXPA-6
Product colorGrey
Product typeATX
More details
Fan configuration1

Questions about this item

How much hold-up time does the FSP300-ATXPA-6 provide at nominal load?

The unit delivers a minimum hold-up time of 17 ms at nominal input, giving the system a brief window to ride through short mains interruptions.

What is the typical noise and heat profile when this supply runs continuously?

A single internal fan cools the 300 W unit; with low ripple and noise specified, acoustic output stays modest during all-day operation.

Which Dell Optiplex models already have the correct mounting and wiring for this replacement?

The supply is a direct upgrade for Dell Optiplex M8802, M8805, M8806 and C9962 (620) chassis.

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