P51181-B21 is the HPE option part number for Broadcom BCM5719 Ethernet 1Gb 4-port BASE-T OCP3 Adapter for HPE. It is an OCP 3.0 mezzanine card built on a single Broadcom BCM5719 controller, presenting four RJ-45 ports that autonegotiate 10Base-T, 100Base-TX and 1000Base-T. The card uses a PCIe 2.0 interface and draws 4.69 W in operation, so it adds copper Gigabit port density through the OCP slot without consuming a standard PCIe expansion slot. Supported servers include DL360 Gen10 Plus, DL380 Gen10 Plus, DL325 Gen10 Plus v2, DL345 Gen10 Plus, DL365 Gen10 Plus, DL385 Gen10 Plus v2, and the Gen11 DL325, DL345, DL365, DL380 and DL385.
HPE Option Part #: P51181-B21
HPE Spare Part #: P51305-001
PRODUCT SPECIFICATIONS FOR P51181-B21:
- Device Type: Network adapter
- Form Factor: Plug-in card
- Interface (Bus) Type: Open Compute Project mezzanine (OCP) 3.0
- PCI Specification Revision: PCIe 2.0
- Ports: Gigabit Ethernet x 4
- Connectivity Technology: Wired
- Cabling Type: Ethernet 10Base-T, Ethernet 100Base-TX, Ethernet 1000Base-T
- Data Link Protocol: Ethernet, Fast Ethernet, Gigabit Ethernet
- Data Transfer Rate: 1 Gbps
- Features: Flow control, ACPI support, wake on LAN (WOL), IPv6 support, IPv4 support, PXE support, Receive Side Scaling (RSS), UEFI support, TCP Segmentation Offload (TSO), UEFI PXE Boot, legacy BIOS PXE Boot, Limited root of trust
- Processor: 1 x Broadcom BCM5719
- Interfaces: 4 x Ethernet 1000 - RJ-45
- Power Consumption Operational: 4.69 Watt
COMPATIBLE WITH:
PROLIANT DL SERIES
** This list may not be complete. Contact us via Live Chat if you have any questions about compatibility.
FREQUENTLY ASKED QUESTIONS ABOUT P51181-B21
What is the difference between P51181-B21 and P51305-001?
They are the same physical adapter under two HPE numbering schemes. This page covers P51181-B21, the option part number, which is the number used when ordering the adapter as a configurable option or standalone upgrade. P51305-001 is the spare part number assigned to the same board for service and replacement fulfillment. The hardware, controller, port count and specifications are identical; only the ordering context differs.
Which servers accept this OCP3 adapter?
P51181-B21 is supported in the HPE ProLiant DL380 Gen11, DL385 Gen11, DL365 Gen11, DL345 Gen11 and DL325 Gen11, and in the DL360 Gen10 Plus, DL380 Gen10 Plus, DL385 Gen10 Plus v2, DL325 Gen10 Plus v2, DL345 Gen10 Plus and DL365 Gen10 Plus. It installs in the server's OCP 3.0 slot rather than a standard PCIe expansion slot.
What speeds and cabling do the four ports support?
Each of the four RJ-45 ports is copper BASE-T and supports Ethernet 10Base-T, Fast Ethernet 100Base-TX and Gigabit Ethernet 1000Base-T, for a maximum data transfer rate of 1 Gb/s per port. Data link protocols supported are Ethernet, Fast Ethernet and Gigabit Ethernet. No transceivers are involved; the adapter terminates directly to structured copper cabling.
Does it support network boot and offload features?
Yes. The adapter supports UEFI PXE Boot and legacy BIOS PXE Boot, along with general PXE and UEFI support, so it can be used for network provisioning in either firmware mode. Offload and scaling features include TCP Segmentation Offload (TSO) and Receive Side Scaling (RSS). It also supports flow control, ACPI, Wake on LAN, IPv4 and IPv6, and includes limited root of trust.
How much power does the card consume?
Operational power consumption is rated at 4.69 W. The adapter is a plug-in OCP 3.0 mezzanine card using a PCIe 2.0 interface, driven by one Broadcom BCM5719 controller serving all four Gigabit ports. The low draw is a consideration when budgeting power and airflow for a densely configured chassis alongside other expansion devices.
HPE PARTSURFER INFO FOR P51181-B21
| Spare PN | Description | |
|---|---|---|
| P51305-001 | SPS-PCA OCP 4p 1Gb BASE-T BCM 5719 Opn |
Last Updated: 2026-08-03
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Returns
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