Power Supply Unit HPE 865438-B21 800W 1U

HPE Flexible Slot Power Supplies offer up to 96% energy efficiency with 80 Plus Titanium-certified options to reduce server power consumption and lower data center energy waste and costs. The compact form factor is 25% smaller than previous generations, freeing space for additional server options and improving overall server capability. Tool-less hot-plug access enables faster, simpler serviceability. These power supplies support HPE ProLiant Gen10, Gen10 Plus and Gen11 servers, selected HPE Apollo Gen10 and Gen10 Plus systems, and HPE Alletra 4100 storage servers, which helps streamline spare parts and reduce operational expenses.

Advantages

High efficiency (up to 96%) minimizes power losses and aligns with EU Lot 9 (EU Commission regulation 2019/424) efficiency requirements. The smaller 25% reduced form factor increases internal space for expansion and enhancements. Tool-less hot-plug design shortens maintenance time and simplifies replacements. Broad compatibility across ProLiant, Apollo, and Alletra platforms reduces the number of different spares required, simplifying inventory and lowering data center costs.

Key specifications

• Efficiency: up to 96% (80 Plus Titanium options)
• Form factor: 25% smaller than previous HPE Common Slot Power Supplies
• Serviceability: tool-less hot-plug access
• Compatibility: HPE ProLiant Gen10, Gen10 Plus, Gen11; selected HPE Apollo Gen10 & Gen10 Plus; HPE Alletra 4100
• Compliance: meets EU Commission regulation 2019/424 (EU Lot 9) efficiency requirements

How to use

Install the Flexible Slot Power Supply in the designated power bay of a supported HPE server or storage system following the server’s hardware installation guide. Use the tool-less hot-plug mechanism for quick insertion and removal while the system is running, if supported by the server model and your maintenance procedures. Verify firmware and system compatibility before deployment and maintain spare units to enable rapid replacement and minimize downtime.

Recommendations

Choose 80 Plus Titanium-certified units where maximum efficiency and compliance with EU Lot 9 are required. Keep at least one compatible spare per critical rack to streamline maintenance and reduce replacement time.