HPE P51083-B21 is the exact ordering identifier covered here, in the ProLiant I/O Expansion Options range. The reviewed specification records type: Riser; summary: PCIe 5.0 x16/x16/x16 secondary riser; first slot requires P56074-B21; fits: HPE ProLiant DL380 Gen11. Use this guide to decide what to include in a configuration request, rather than treating similar model numbers as interchangeable.
Specifications that define this model
The values below retain the source qualifiers. A missing field is not evidence that a capability is included or absent.
| Specification | Recorded value |
|---|---|
| Type | Riser |
| Summary | PCIe 5.0 x16/x16/x16 secondary riser; first slot requires P56074-B21 |
| Fits | HPE ProLiant DL380 Gen11 |
How to evaluate this exact configuration
Option category
Option category for P51083-B21: Riser. Identify the exact function before comparing ordering codes. Similar-looking accessories can occupy different positions or require different companion parts.
Configuration details
Configuration details for P51083-B21: PCIe 5.0 x16/x16/x16 secondary riser; first slot requires P56074-B21. Carry these details into the bill of materials. Check brackets, slots, cables, cooling and companion parts against the platform configuration guide rather than assuming they are bundled.
Documented platform scope
Documented platform scope for P51083-B21: HPE ProLiant DL380 Gen11. Check the precise generation and installed configuration. The named platform establishes the scope to investigate, not unconditional fitment in every chassis.
Compare nearby ordering codes
| Model | Summary | Type | Fits |
|---|---|---|---|
| P51083-B21 | PCIe 5.0 x16/x16/x16 secondary riser; first slot requires P56074-B21 | Riser | HPE ProLiant DL380 Gen11 |
| P48803-B21 | PCIe 5.0 x16/x16/x16 primary riser; first slot requires P56073-B21 | Riser | HPE ProLiant DL380 Gen11 |
These are specification comparisons, not statements that the models are drop-in replacements. Compare the configuration limits before choosing an alternative.
P48803-B21 manufacturer reference
Questions before you request a quote
Which product does P51083-B21 identify?
It identifies HPE ProLiant DL380 Gen11 3x16 secondary riser kit. Keep P51083-B21 on the requirement and quote; a family name alone does not fix the ordering configuration.
What compatibility scope is recorded for P51083-B21?
The recorded scope is HPE ProLiant DL380 Gen11. Confirm the exact machine generation and configuration in the manufacturer guide; this is not a blanket compatibility promise.
What should I check before ordering P51083-B21?
Start with the specification and configuration checks above, then state the quantity, destination and intended connections or platform. Ask for the exact contents of the offered configuration and identify every proposed substitution separately.
Build a clear requirement
Specify P51083-B21, quantity and delivery country, then add the configuration information discussed above. Keep accessories and any accepted alternative as separate lines. Request current pricing and availability rather than relying on an article for live commercial information.
View the P51083-B21 product listing · Browse HPE server options · Request a quote
For the wider selection process, read the related buying guide.
Sources and scope
Document and identifier checks: 2026-10-17. Prepared from manufacturer documentation and the catalogue's recorded specifications; no hands-on benchmark is claimed. Confirm destination-specific options and configuration eligibility against the source documents. Prices, stock, delivery dates and coverage terms are not established by this guide.