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Compact rectangular platinum server power module with hot-plug handle and ventilation grille

HP

HP 800W Flex Slot Platinum Power Supply Kit 720479-B21

SKU CH-H0M5-FZ0JV

800W hot-pluggable server power supply with 94% efficiency and 100-240V input

  • Max wattage800 W
  • Power efficiency94
  • Supply voltage100–240 V
  • Product typePower Module
  • Key featuresHot Pluggable
  • 94% efficiency cuts energy waste with 80Plus Platinum certification
  • 800W output powers demanding server workloads reliably
  • Hot-pluggable design enables tool-less replacement without downtime
  • 25% smaller form factor frees space for additional server options
  • Supported across ProLiant DL300 Gen9 family simplifies spares strategy

HP 800W Flex Slot Platinum Power Supply Kit

The HP 800W Flex Slot Platinum Power Supply Kit is a hot-pluggable server power module rated for 800 watts maximum output. It targets administrators running ProLiant DL300 Gen9 servers who need efficient, redundant power in a compact form factor.

800W capacity with 94 percent efficiency

At 800 watts the unit comfortably handles typical dual-socket workloads and leaves headroom for additional storage or networking cards. Efficiency reaches 94 percent under the 80Plus Platinum rating, so power waste drops measurably across 100 to 240 volt input ranges. Loads sustained near the 800 watt limit will exhaust the module’s headroom.

Platinum efficiency reduces heat and noise

The 94 percent efficiency means less energy converts to heat, keeping exhaust temperatures lower during normal operation. Hot-plug capability allows replacement without shutting down the server, avoiding thermal spikes from emergency shutdowns. Fan speed scales with load, so typical enterprise workloads run quieter than older 75 percent efficient designs.

How it compares

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

Price $22.99
Cheaper than about 95% of the 3,798 comparable items (median $131.99).
Max wattage 800 W
Higher than about 70% of the 235 comparable items (median 668 W).

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Specifications

Product
Brand nameHP
Product typePower Module
Power
Max wattage800 W
Power efficiency94
Supply voltage100–240 V

Questions about this item

Will the 800W Flex Slot Platinum supply fit in my ProLiant DL300 Gen9 server alongside existing power modules?

Yes, the Flex Slot form factor is supported across the entire ProLiant DL300 Gen9 family and is 25% smaller than the previous generation, leaving room for additional server options.

How can I confirm the unit is delivering 94% efficiency after installation?

The power supply is 80Plus Platinum-certified at 94% efficiency; monitoring tools in the server management interface will report real-time input and output power to verify performance.

Does the kit include the power cable or do I need to order it separately?

The kit contains the hot-pluggable 800W Flex Slot Platinum power module (part 720479-B21); AC power cables are not included and must be purchased separately.

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