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Silver rectangular server power supply unit with rear fan grille and backplane connector

Supermicro

Supermicro PWS-981-1S 980W single server power supply

SKU CH-427P-JDX4X MPN PWS-981-1S

Delivers 980W of single-server power with +12V@81A and +5VSB@4A output in a 13.58" backplane form factor

  • TypeOthers
  • Single/RedundantSingle
  • Maximum Power980W
  • Output Current+12V@81A, +5VSB@4A
  • FeaturesBackplane
  • Dimensions13.58" x 2.99" x 1.58"
  • 980W single output powers dense server builds
  • +12V rail delivers 81A for high-current CPUs and GPUs
  • 5V standby rail supplies 4A for management controllers
  • Backplane feature enables direct chassis integration
  • Compact 13.58" x 2.99" x 1.58" form factor fits 1U and 2U racks

Purpose and fit

The Supermicro PWS-981-1S is a 980W single server power supply built for rackmount chassis that accept a backplane form factor. It delivers +12V at 81A and +5VSB at 4A for compute nodes that rely on a single high-output unit rather than a redundant pair.

Thermals and acoustics

The unit uses internal forced-air cooling matched to its backplane layout; airflow direction follows the chassis design rather than a standalone fan curve. Under typical server loads the supply runs within its thermal envelope without external acoustic data published.

Sustained load behaviour

At continuous 980W output the +12V rail maintains 81A while the +5VSB rail holds 4A for management controllers. The single-module design means no failover capacity; thermal protection will throttle or shut down if chassis airflow is insufficient for prolonged periods.

Points forts

  • 980W single output powers dense server builds
  • +12V rail delivers 81A for high-current CPUs and GPUs
  • 5V standby rail supplies 4A for management controllers
  • Backplane feature enables direct chassis integration
  • Compact 13.58" x 2.99" x 1.58" form factor fits 1U and 2U racks

Caractéristiques

BrandSuperMicro
ModelPWS-981-1S
TypeOthers
Single/RedundantSingle
Maximum Power980W
Output Current+12V@81A, +5VSB@4A
FeaturesBackplane
Dimensions13.58" x 2.99" x 1.58"
Poids d’expédition2.27 kg
Dimensions du colis345 × 76 × 40 mm

Questions sur cet article

How do I install the PWS-981-1S into a server backplane and which orientation mistake should I avoid?

Slide the unit into the chassis until the backplane connector seats firmly; the 13.58" depth means it only fits one way, so align the latch before pushing.

Which component of the PWS-981-1S will need replacement first and how can I tell?

The internal cooling fan typically wears out first; listen for rising noise or watch for temperature alerts on the +12V rail.

What limit appears first when the PWS-981-1S runs at full load for long periods?

The +12V rail hits its 81A ceiling at 980W, so sustained draws near that level trigger thermal throttling before any other limit.

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