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Rectangular silver 1U server PSU, 12.6 by 2.17 by 1.57 inches, 20-pin connector

Supermicro

Supermicro PWS-651-1R 650W 1U server power supply

SKU CH-KFKX-NVK6J MPN PWS-651-1R

A 650 W 1U server power supply with a 20-pin main connector, +12 V at 54 A and +5 VSB at 3 A, measuring 12.6" × 2.17" × 1.57" and weighing 2.2 lbs

  • Max wattage650 W
  • Main power connector20Pin
  • Output current+12 V@54A, +5VSB@3A
  • Product dimensions12.6 in × 2.17 in × 1.57 in
  • Product weight2.2 lb (1 kg)
  • 650 W output powers dense 1U server builds
  • 20-pin main connector fits compatible Supermicro chassis
  • +12 V rail delivers 54 A for CPU-heavy loads
  • Compact 12.6 × 2.17 × 1.57 in form factor saves rack depth
  • Light 2.2 lb unit eases hot-swap maintenance

650W 1U Server Power Supply

The Supermicro PWS-651-1R is a new 650W unit built for 1U rack-mount servers. It fits standard redundant bays and supports hot-swap replacement without shutting the system down. This supply targets administrators who need reliable AC-to-DC conversion in dense compute clusters.

20-Pin Main Connector

The single specification that decides compatibility is the 20-pin main connector, which differs from the more common 24-pin ATX layout. The rail delivers +12V at 54A and +5VSB at 3A. Verify the server backplane pin-out before ordering, because an adapter is not included.

Hot-Swap Form Factor

The 1U hot-swap chassis lets technicians slide a replacement unit into the live bay while the remaining supplies share the load. No extra cables, mounting brackets or management software ship with the supply. Buyers who need redundant cabling or a separate PDU must source those separately.

How it compares

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

Price $105.99
Cheaper than about 66% of the 3,798 comparable items (median $131.99).
Max wattage 650 W
Typical for this category: the median of 235 items is 668 W.

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Specifications

Product
Brand nameSuperMicro
Model namePWS-651-1R
Power
Max wattage650 W
Main power connector20Pin
Output current+12 V@54A, +5VSB@3A
Size & build
Product dimensions12.6 in × 2.17 in × 1.57 in
Product weight2.2 lb (1 kg)
Shipping weight1.29 kg
Package size362 × 89 × 51 mm

Questions about this item

What does the 650 W rating mean for a server running near full load?

The unit can deliver up to 650 W continuously, with the +12 V rail supplying up to 54 A to power CPUs, memory and drives in a 1 U chassis.

What does the 20-pin main connector limit in practice?

The 20-pin main connector is designed for Supermicro 1 U server boards that accept this pinout; it will not fit standard 24-pin ATX motherboards without an adapter.

Will the 12.6 x 2.17 x 1.57 inch form factor fit my 1 U rack chassis?

Yes, the supply matches the standard 1 U redundant PSU footprint of 12.6" depth, 2.17" width and 1.57" height for hot-swap bays.

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