HP 511777-001 AC power supply - 460W hot-plug, high-efficiency, common slot (Option 503296-B21) HP's CS Gold Plus Power Supplies provide a power efficiency rating of up to 94% Input Voltage Range: 100-240V Output: 460W Max. Frequency Range (Nominal): 50/60Hz Compatibility: HP Common Slot High Efficiency Power is compatible with wide range of ProLiant Servers mostly Generation G6, G7 and G8.