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Rectangular silver server power supply with handle and ventilation grille

HP

HP 720479-B21 800W Flex Slot Platinum Hot Plug Power Supply

SKU CH-BE1N-F0D07 MPN 720479-B21

Delivers 800 W with 94 % efficiency in a hot-plug Flex Slot design that is 25 % smaller than the previous generation

  • Product typeConsumer Electronics
  • Product weight3
  • 800 W output powers demanding server workloads
  • 94 % efficiency cuts energy waste and heat
  • 80 Plus Platinum certification confirms top-tier efficiency
  • Hot-plug design enables tool-less replacement without downtime
  • 25 % smaller form factor frees space for extra server options

800W Flex Slot Platinum Power Supply

This 800 watt hot-plug power supply kit is built for HPE ProLiant DL300 Gen9 servers. It delivers 80 Plus Platinum certified efficiency up to 94 percent, reducing power waste in data centre racks. The Flex Slot form factor is 25 percent smaller than previous designs, freeing space for additional server options. It suits administrators who need redundant, high-efficiency power in a dense chassis.

Tool-less hot-plug installation

The module slides into the Flex Slot bay without tools and locks with a built-in latch, so failed units can be swapped while the server stays online. Alignment tabs guide the connector, preventing bent pins during rapid replacement. The only common issue is inserting the unit upside-down in low-light racks; the keyed notch prevents damage but forces a re-seat. No cables or screws are required, keeping service time to seconds.

Sustained 94 percent efficiency under load

At continuous 800 watt output the supply maintains its Platinum rating, keeping heat output and fan speed lower than lower-rated units. The 25 percent smaller chassis still moves enough air for steady operation in fully populated DL300 Gen9 bays. Efficiency drops only marginally above 80 percent load, so power draw stays predictable during prolonged compute peaks. It is not for builds that need 1400 watt capacity or non-Flex-Slot chassis.

How it compares

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

Price $253.99
Pricier than about 79% of the 3,798 comparable items (median $131.99).

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Specifications

Product
Brand nameHewlett Packard
Model name720479-B21
Product typeConsumer Electronics
Size & build
Shipping weight1.81 kg
Package size381 × 178 × 140 mm

Questions about this item

How can I verify the 800W Flex Slot Platinum unit is operating correctly after installation?

The server's iLO or management console will show the power supply as present, delivering up to 800 Watt with 94% efficiency, and the module's status LED should display a steady green indication.

What comes with the 720479-B21 kit and what must be sourced separately?

The kit includes the 800W Flex Slot Platinum hot-plug power module; a compatible power cord and a supported ProLiant DL300 Gen9 chassis are not included.

Which capacity should I choose between the 800W and 1400W Flex Slot Platinum supplies?

Select the 800W unit when the server configuration stays within 800 Watt; choose the 1400W model if the planned load exceeds that threshold.

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