865414-B21: HPE 800W Flex Slot Platinum Hot Plug Low Halogen Power Supply Kit

Also listed as: 865414-001, 866730-001, 865412-101, 865412-201, DPS-800AB-34 A · made by Delta Electronics

The HPE 865414-B21 is an 800-watt hot-pluggable power supply module certified for 80 PLUS Platinum efficiency (up to 94%) in the standardized HPE Flexible Slot physical form factor. Designed for tool-less hot-plug replacement and N+1 or N+N redundancy across HPE ProLiant Gen9, Gen10, and Gen10 Plus rack servers, it supports both low-line (100-127VAC) and high-line (200-240VAC / 240VDC) inputs. When buying used units, check for bent backplane edge fingers, verify fan spin freely without bearing noise, and confirm iLO reports valid power telemetry.

Specifications

About the 865414-B21

865414-B21 is HPE's 800W Flex Slot Platinum Hot Plug Low Halogen Power Supply Kit. Rated for 80 PLUS Platinum certification with up to 94 percent electrical efficiency, it is the most ubiquitous server power supply deployed across ProLiant Gen9, Gen10, and Gen10 Plus architectures. Built in HPE's standardized Flexible Slot physical form factor (25 percent smaller than previous Common Slot supplies), it supports hot-plug tool-less replacement and electrical redundancy (1+1 or N+N), accepting universal inputs from 100V to 240V AC as well as 240V DC.

Compatibility

This power supply installs into any HPE Flexible Slot bay across ProLiant Gen9, Gen10, and Gen10 Plus rack and tower servers, including the DL360 Gen10/Plus, DL380 Gen10/Plus, DL385 Gen10/Plus, DL560 Gen10, DL580 Gen10, and ML350 Gen10, as well as Apollo 2000 and 4000 systems. It requires a standard IEC C13 power cord. Both power supplies in a redundant pair should share identical wattage and efficiency levels; mixing an 800W unit with 500W or 1600W supplies is unsupported. The option part is 865414-B21, with spare numbers 866730-001 and 865414-001.

How to identify a genuine unit

A genuine 865414-B21 features an HPE product label stating part number 865414-B21, spare number 866730-001, GPN 865412-101 (or -201), the 80 PLUS Platinum logo, and an authentic serial barcode. Inside iLO (iLO 4 or iLO 5) under Power Management, the supply is identified with authentic HPE firmware, reporting real-time input voltage, current wattage draw, thermal readings, and serial tracking. Generic or third-party power supplies will report generic vendor strings and may disable advanced dynamic power capping.

Buying used

Due to huge production volumes, used 800W Flex Slot power supplies are readily available at attractive price points. When buying used, inspect the rear gold card edge connector for bent or burned contact traces caused by insertion arcing. Check the internal cooling fan for excessive dust accumulation and spin it by hand to verify smooth, quiet bearing rotation. Confirm that the red release latch engages firmly and verify that iLO reports a healthy power supply status upon installation.

Reference prices (last 14 days, updated 2026-10-27)

Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.

Fits these models

• HPE ProLiant DL380 Gen10
• HPE ProLiant DL380 Gen10 Plus
• HPE ProLiant DL360 Gen10
• HPE ProLiant DL360 Gen10 Plus
• HPE ProLiant DL385 Gen10 Plus v2
• HPE ProLiant DL325 Gen10 Plus v2
• HPE ProLiant DL560 Gen10
• HPE ProLiant DL580 Gen10
• HPE ProLiant ML350 Gen10

FAQ

Sources

• HPE Flexible Slot Power Supplies QuickSpecs, checked 2026-10-27