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P21109-B21: HPE Ethernet 10Gb 4-port BASE-T BCM57416 Adapter

HPE P21109-B21 Network adapterPCIe 3.0 x810GbEStandup PCIe Card
HPENetwork adaptersPCIe 3.0 x8

Also listed as: P22784-001, P21111-001, BCM957416A4160C, BCM57416 · made by Broadcom

The HPE P21109-B21 is a high-density quad-port 10GBASE-T copper PCIe network adapter powered by the Broadcom BCM57416 controller. It delivers four 10Gbps RJ-45 copper ports on a single PCIe 3.0 x8 card, supporting hardware RoCE v2, packet filtering, and SR-IOV across HPE ProLiant Gen10, Gen10 Plus, and Gen11 servers. Used buyers should test all four RJ-45 ports under load and verify thermal heatsink condition.

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Specifications

Part numberP21109-B21
BrandHPE
Made byBroadcom
TypeNetwork adapters
Other numbersP22784-001, P21111-001, BCM957416A4160C, BCM57416
Statuscurrent
Speed10GbE
Ports4x RJ-45 10GBASE-T
InterfacePCIe 3.0 x8
Form factorStandup PCIe Card
ControllerBroadcom BCM57416
Generation fitGen10 / Gen10 Plus / Gen11

About the P21109-B21

The HPE P21109-B21 is a 4-port 10GBASE-T Ethernet PCIe network adapter tailored for multi-tenant hypervisors and high-density networking environments. Powered by the Broadcom BCM57416 NetXtreme-E ASIC, it provides four independent 10Gbps copper connections over standard Cat6/Cat6A RJ-45 cabling. It provides hardware RoCE v2, network virtualization encapsulation offloads (VXLAN, Geneve, NVGRE), and advanced packet processing on a single PCIe slot.

Compatibility

Compatible with HPE ProLiant Gen10, Gen10 Plus, and Gen11 rack servers including DL380, DL360, DL385, and DL560. Requires a physical and electrical PCIe 3.0 x8 or x16 slot. Because four 10GBASE-T copper physical layers draw higher power and generate more thermal output than dual-port adapters, the card features an elongated heatsink requiring standard chassis fan airflow.

How to identify a genuine unit

Genuine HPE boards display a tracking label indicating Option Part Number P21109-B21, Spare Part Number P22784-001, and Assembly Part Number P21111-001. Silkscreen on the card references Broadcom board design BCM957416A4160C. In iLO management interfaces, it registers as 'HPE Ethernet 10Gb 4-port BCM57416 Adapter' with four distinct hardware MAC addresses.

Buying used

When acquiring used P21109-B21 adapters, ensure all four RJ-45 jacks have intact retention clips and clean internal contact pins. Quad 10GBASE-T adapters experience considerable heat cycling; verify that the heatsink is securely attached with tensioned push pins and that thermal paste has not completely dried out. Power the card in a server to confirm that all four ports link at 10Gbps without intermittent disconnects.

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

New: USD 465 (1 sighting, Oct 2026)

Refurbished: USD 225 (1 sighting, Oct 2026)

All sightings
SellerConditionPriceNoteSeen
serversupply.comnewUSD 465New factory sealed retail option kit2026-10-27
globalonetechnology.comrefurbishedUSD 225Refurbished card, all 4 ports tested2026-10-27

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

Fits these models

Works together

How the HPE P21109-B21 connects to servers, storage and the network: 3 ways, with the hardware on each path.

iSCSI and NVMe/TCP over EthernetFile storage (NFS and SMB)Hyperconverged cluster

iSCSI and NVMe/TCP over Ethernet

Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.

Switches

Storage

Optics

iSCSI and NVMe/TCP over Ethernet: how it fits together

File storage (NFS and SMB)

Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.

Switches

Storage

Optics

File storage (NFS and SMB): how it fits together

Hyperconverged cluster

Plan at least two 25GbE ports per node to two switches; all-NVMe clusters often move to 100GbE.

HCI nodes

Switches

Optics

Hyperconverged cluster: how it fits together

Plan and size it

Check compatibility with HPE

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that HPE has tested with the HPE P21109-B21.

Equivalent part numbers

FAQ

Can P21109-B21 negotiate at 1GbE speeds?

Yes, each of the four RJ-45 ports supports auto-negotiation to 1GbE and 10GbE network switches based on connected cable and switch port capability.

What is the OCP 3.0 equivalent of P21109-B21?

The OCP 3.0 version utilizing the same quad-port BCM57416 controller is HPE part number P21112-B21.

Buying or selling P21109-B21?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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Sources