HPE 744689-B21 800W/900W AC server power supply

Redundant 800W and non-redundant 900W operation

The HPE 744689-B21 power module delivers 800 W when installed in a redundant pair and 900 W as a single unit. It accepts 120 V or 230 V AC input and fits ProLiant servers that use this form factor. The Gold-rated efficiency helps reduce operating cost in dense racks. IT teams managing business-critical workloads gain a hot-pluggable supply built for continuous uptime.

Gold efficiency rating changes thermal load

The 80 Plus Gold certification means less waste heat at typical loads, so the chassis fans can run slower and draw less power themselves. No extra cables or management software are included; the module connects directly to the server backplane. This simplicity speeds replacement during a maintenance window and avoids compatibility checks with third-party accessories.

Compact 2 by 4.2 by 1.5 inch metal housing

The enclosure measures 2 in high, 4.2 in wide and 1.5 in deep and weighs 14.11 oz, so it slides into the standard power bay without tools. A built-in latch secures the unit and provides a clear tactile click when fully seated. The AC inlet uses a common IEC C14 connector, letting you reuse existing rack PDU cords. The design lacks an external switch, so power state is controlled entirely by the server.