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Silver rectangular redundant server PSU with rear fan grille and 20+4 pin connector

Supermicro

Supermicro PWS-902-1R 900W server power supply

SKU CH-BB80-5TBHZ MPN PWS-902-1R

Redundant 900W server supply with 20+4Pin main connector delivering +12V at 75A and 5V standby at 4A

  • Max wattage900 W
  • Main power connector20+4Pin
  • Output type+12 V@75A, 5 V Standby@4A
  • Product dimensions2.99 in × 1.57 in × 14.17 in
  • Product weight2.43 lb (1.1 kg)
  • 900 W output powers dense server chassis
  • 75 A on the +12 V rail feeds multi-CPU platforms
  • 20+4 pin main connector fits standard ATX motherboards
  • Redundant hot-swap design keeps systems running during replacement
  • Compact 2.99 x 1.57 x 14.17 inch form factor saves rack space

900W Redundant Server Power Supply

The Supermicro PWS-902-1R delivers 900W of continuous power in a redundant form factor. It uses a standard 20+4Pin main connector for motherboard compatibility. The unit provides +12V at 75A and a 5V standby rail at 4A. It measures 2.99" x 1.57" x 14.17" and weighs 2.43 lbs.

Suitable for Redundant Chassis Builds

This supply suits administrators populating redundant bays in compatible Supermicro chassis. It is not for desktop PCs or workstations lacking the required backplane and form-factor support. Buyers needing non-redundant ATX units or higher wattage per module should look elsewhere.

900W Capacity with 12V Headroom

The 900W rating comfortably handles dual-socket servers with moderate GPU or storage density. The +12V rail at 75A supports CPU-heavy workloads and multiple drive arrays. Configurations demanding more than 900W per node or higher 12V current will exceed this module’s limits.

How it compares

Measured against everything we stock in Server & Hot-Plug PSUs, at today’s prices. Recalculated every night.

Price $130.99
Typical for this category: the median of 3,798 items is $131.99.
Max wattage 900 W
Higher than about 73% of the 235 comparable items (median 668 W).

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Specifications

Product
Brand nameSuperMicro
Model namePWS-902-1R
Ports & slots
Output type+12 V@75A, 5 V Standby@4A
Power
Max wattage900 W
Main power connector20+4Pin
Size & build
Product dimensions2.99 in × 1.57 in × 14.17 in
Product weight2.43 lb (1.1 kg)
Shipping weight2.06 kg
Package size437 × 180 × 122 mm

Questions about this item

Does my chassis have a redundant power-supply bay that accepts a 2.99" x 1.57" x 14.17" unit?

The supply measures 2.99" x 1.57" x 14.17" and weighs 2.43 lbs, so it fits standard redundant bays built to that form factor.

Will the 20+4Pin main connector and +12V@75A output work with my existing motherboard that uses a 20+4Pin ATX header?

Yes, the 20+4Pin main connector mates directly with a standard 20+4Pin ATX header and the +12V rail delivers up to 75A for compatible boards.

How can I verify the unit is operating correctly once installed in a redundant pair?

The supply provides +12V@75A and 5V standby@4A; matching those voltages on the motherboard sensor readings confirms normal operation.

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