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Rectangular silver server power supply unit with rear fan grille and 24-pin connector

Supermicro

Supermicro PWS-406P-1R 400W server power supply

SKU CH-GDRP-MF4Y4 MPN PWS-406P-1R

Delivers 400W via a 24-pin connector with 12V at 33A and 80 Plus PFC in a compact redundant form factor

  • Max wattage400 W
  • Main power connector24Pin
  • Output current+12 V@33A, 5 V Standby@3A
  • Key featuresPFC: Yes 80 Plus
  • Product dimensions8.66 in × 1.97 in × 1.57 in
  • Delivers 400W for stable server operation
  • 24-pin main connector fits standard server boards
  • Active PFC improves power efficiency and quality
  • 80 Plus certification confirms high energy efficiency
  • Compact 8.66 x 1.97 x 1.57 inch form factor

400W redundant server supply

The Supermicro PWS-406P-1R is a 400W hot-swap power module built for 1U and 2U rackmount servers. It delivers +12V at 33A plus a 5V standby rail at 3A through a single 24-pin main connector. The unit carries 80 Plus certification and active PFC for efficient AC-to-DC conversion in always-on environments.

Redundant form factor and cabling

At 8.66" x 1.97" x 1.57" the supply slides into a standard redundant bay and locks with a thumbscrew, letting technicians swap units without tools or downtime. The 24-pin output mates directly to compatible Supermicro backplanes, so no adapter cables are required. Active PFC and 80 Plus rating reduce waste heat, easing cooling load in dense racks.

Replaces failed or capacity-constrained modules

This unit restores full redundancy when an identical module fails or when a lower-wattage supply can no longer support added drives or CPU upgrades. The jump is worth it when the chassis already accepts the PWS-406P-1R form factor and the 400W ceiling matches the new load calculation. Servers needing higher output or a different connector layout cannot use this module.

How it compares

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

Price $152.99
Pricier than about 58% of the 3,798 comparable items (median $131.99).
Max wattage 400 W
Lower than about 70% of the 235 comparable items (median 668 W).

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Specifications

Product
Brand nameSuperMicro
Model namePWS-406P-1R
Power
Max wattage400 W
Main power connector24Pin
Output current+12 V@33A, 5 V Standby@3A
Size & build
Product dimensions8.66 in × 1.97 in × 1.57 in
Shipping weight1.47 kg
Package size381 × 184 × 140 mm

Questions about this item

What does the 24-pin main connector limit in practice?

The 24-pin main connector delivers up to 400W total, with the +12V rail capped at 33A and 5V standby at 3A.

Will the 8.66" x 1.97" x 1.57" module fit my 1U chassis?

At 1.57" tall and 1.97" wide it matches the standard 1U redundant form factor; verify your chassis accepts this exact length.

How is the unit installed and what step is often missed?

Slide the module into the bay until the latch clicks, then secure the retention screw; skipping the screw leaves the unit loose under vibration.

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