HPE DL560 GEN10 3X8 1P Slimline Riser - 873420-B21

HPE 873420-B21 DL560 Gen10 3x8 1P Slimline Riser

Overview

The 873420-B21 is a Slimline PCIe riser card designed specifically for the HPE ProLiant DL560 Gen10 server in single-processor (1P) configurations. It provides three x8-lane PCIe slots, expanding the I/O capacity of a 1P DL560 Gen10 deployment where the base riser complement falls short of the card count required — common in storage-heavy or network-intensive builds where multiple HBAs, NICs, or accelerators need to coexist in the same chassis. At 1.36 lb, this is a passive riser assembly that slots into the designated riser bay; no external power cabling is required beyond what the chassis already provides.

Compatibility

Verified for the HPE ProLiant DL560 Gen10 platform only, in single-processor (1P) populated configurations. The DL560 Gen10 is a 4-socket capable 2U server; this riser is specifically matched to the 1P slot layout — do not install in a 2P, 3P, or 4P configuration without confirming HPE's official riser matrix for your processor count. Compatibility with DL560 Gen9 or other ProLiant families (DL380, DL380, DL560 Gen9) is not supported by available evidence — verify against HPE's QuickSpecs before ordering for any variant outside the confirmed Gen10 1P use case.

Installation Notes

Install into the designated Slimline riser bay on the DL560 Gen10 system board following HPE's published maintenance procedures for the platform. The Slimline connector format requires firm, even seating — partial engagement will prevent POST. Confirm processor population matches the 1P configuration this riser is rated for before installation; mismatched population can leave PCIe lanes uninitialized. Consult the PCIe riser compatibility matrix in the DL560 Gen10 QuickSpecs document to validate which riser positions are active for your specific processor and memory configuration before installing expansion cards into any of the three x8 slots.