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Rectangular silver metal server power module with side handle and rear connector

HP

HP 800W Flex Slot -48VDC Power Supply Kit 720480-B21

SKU CH-4DHF-KKJWT

Delivers 800W at 96% efficiency in a hot-pluggable Flex Slot form factor for -48VDC server racks

  • Max wattage800 W
  • Power efficiency96
  • Supply voltage-40 -72 V
  • Product typePower Module
  • Key featuresHot Pluggable
  • 96 % efficiency cuts data-centre power waste
  • 800 W output supports dense ProLiant DL300 Gen9 deployments
  • Hot-plug design enables tool-less replacement without downtime
  • 25 % smaller form factor frees space for extra server options
  • 48 VDC input suits telecom and DC-powered racks

800W -48VDC Flex Slot power supply

This 800W HP Flex Slot power supply accepts a -40 to -72 V DC input and delivers up to 96 percent efficiency. It is built for ProLiant DL300 Gen9 servers that run on DC power infrastructure. The hot-pluggable design lets technicians swap modules without shutting the system down.

Sustained-load behaviour with Titanium efficiency

At continuous load the unit maintains its 96 percent Titanium-rated efficiency, reducing waste heat and lowering overall data-centre power draw. The 25 percent smaller form factor leaves more room for additional server options while keeping output stable. Hot-plug capability means a failed module can be replaced while the remaining units keep the rack online.

Thermals, noise and power draw in normal use

High efficiency translates into less heat exhaust and quieter fan operation during typical workloads. The DC input range of -40 to -72 V matches standard telecom rectifier outputs, simplifying power distribution. Hot-plug serviceability avoids planned downtime for routine maintenance or capacity changes.

How it compares

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

Price $23.99
Cheaper than about 94% 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 efficiency96
Supply voltage-40 -72 V

Questions about this item

How much heat does the 800W Flex Slot supply add when it runs at 96 percent efficiency all day?

At 96 percent efficiency the unit converts most input power to output, so waste heat stays low during continuous operation.

What server chassis and slot type are required to install this -48VDC Flex Slot kit?

It fits HP ProLiant DL300 Gen9 servers that accept Flex Slot power supplies and uses the hot-pluggable Flex Slot form factor.

Can this Flex Slot 800W unit share a chassis with older non-Flex Slot power supplies?

The Flex Slot design is 25 percent smaller than previous generation supplies, so it only works in bays built for the Flex Slot form factor.

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