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Rectangular silver server power supply module with side handle and connector face

HPE

HPE 865434-B21 800W Flex Slot -48VDC server power supply

SKU CH-XK8V-XBFD7 MPN 865434-B21

An 800W hot-plug server power module accepting -48VDC input with 96% efficiency and 80Plus Titanium certification

  • Supply voltage230 V AC 380 V DC
  • Product typePower Module
  • Up to 96% efficiency cuts data-centre power waste
  • 800W output in a 25% smaller Flex Slot form factor
  • Hot-plug design enables tool-less replacement without downtime
  • 80 Plus Titanium certification confirms top-tier efficiency
  • Compatible across HPE ProLiant Gen10 and 300 Series Gen9 servers

800W -48VDC Flex Slot power supply

This HPE power module delivers 800 watts from a -48 V DC input and fits the Flex Slot form factor. It carries 80 Plus Titanium certification with up to 96 percent efficiency. The unit supports hot-plug replacement in compatible HPE ProLiant Gen10 and Gen9 300 Series servers. Its low-halogen construction meets restricted-materials requirements.

Suited for DC-powered HPE racks

Data centres running -48 V DC distribution can use this supply to simplify spares across supported ProLiant platforms. The 25 percent smaller footprint frees space for additional server options. Facilities that require AC input or need higher single-unit wattage should evaluate alternative power modules.

Sustained load behaviour

At continuous operation the Titanium-rated design maintains 96 percent efficiency, reducing waste heat and lowering cooling demand. Hot-plug capability allows a failed unit to be swapped without shutting down the server. The 380 V DC input rating also permits direct DC feeds where infrastructure allows.

How it compares

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

Price $362.99
Pricier than about 88% of the 3,798 comparable items (median $131.99).

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Specifications

Product
Brand nameHPE
Product typePower Module
Power
Supply voltage230 V AC 380 V DC
Size & build
Shipping weight1.81 kg
Package size381 × 191 × 140 mm

Questions about this item

Which HPE server families accept the 865434-B21 Flex Slot power supply?

The 800 W unit is supported across the entire HPE ProLiant Gen10 and HPE ProLiant 300 Series Gen9 families, simplifying spares strategy.

Does the 800 W Flex Slot supply work with older ProLiant Gen9 servers?

Yes, it is supported on the HPE ProLiant 300 Series Gen9 family, allowing the same power module to serve both Gen9 and Gen10 platforms.

How can I verify the 865434-B21 is operating at its rated 96 % efficiency after installation?

The 80Plus Titanium certification guarantees up to 96 % efficiency; monitor input and output power via the server iLO interface to confirm real-world performance.

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