3X-H7911-AA HP ALPHASERVER DS25 POWER SUPPLY 30-10047-01
Two 500-watt power supplies included with system; optional third power supply provides N+1 redundancy (power cord not included, select power cord from Step 2e). Earlier (D*-57AAA-**) models with 375-watt power supplies require three power supplies when configured with greater than 8 GB of memory. N+1 functionality is not supported in earlier models in configurations with over 8 GB.
DS25 500-watt redundant power supply