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P10112-B21: HPE Ethernet 10/25Gb 2-port SFP28 MCX512F-ACHT Adapter

HPE P10112-B21 Network adapterPCIe 3.0 x825GbEStandup PCIe Card
HPENetwork adaptersPCIe 3.0 x8

Also listed as: P12867-001, P10114-001, MCX512F-ACHT, ConnectX-5 · made by Mellanox

The HPE P10112-B21 is a high-speed dual-port 10/25GbE SFP28 PCIe adapter built with the Mellanox ConnectX-5 EN controller. It delivers sub-microsecond latency, hardware-based RoCE v2, and ASAP2 (Accelerated Switching and Packet Processing) offloads for software-defined networking across HPE ProLiant Gen10, Gen10 Plus, and Gen11 platforms. Used buyers should verify optical port integrity and confirm full-height and low-profile bracket availability.

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Specifications

Part numberP10112-B21
BrandHPE
Made byMellanox
TypeNetwork adapters
Other numbersP12867-001, P10114-001, MCX512F-ACHT, ConnectX-5
Statuscurrent
Speed25GbE
Ports2x SFP28
InterfacePCIe 3.0 x8
Form factorStandup PCIe Card
ControllerMellanox ConnectX-5 EN
Generation fitGen10 / Gen10 Plus / Gen11

About the P10112-B21

The HPE P10112-B21 is an enterprise 2-port 10/25GbE PCIe network adapter powered by NVIDIA Mellanox ConnectX-5 EN technology. It provides two SFP28 ports capable of operating at 10Gb/s or 25Gb/s speeds over optical fiber or direct attach copper cabling. Renowned for low latency and high packet rates, ConnectX-5 is particularly prized for OpenStack, Kubernetes CNI acceleration, Ceph storage clusters, and DPDK network functions virtualization workloads.

Compatibility

Installs into standard PCIe 3.0 x8 or x16 slots on primary or secondary risers of HPE ProLiant Gen10, Gen10 Plus, and Gen11 rack servers (including DL380, DL360, DL385, and DL560). It supports both low-profile and standard-profile server chassis slots with interchangeable brackets. If deploying in an OCP 3.0 slot rather than a standard PCIe riser, select the OCP 3.0 equivalent model P10111-B21 instead.

How to identify a genuine unit

Genuine HPE units bear a barcode label stating Option Part Number P10112-B21, Spare Part Number P12867-001, and Assembly Part Number P10114-001. The PCB silkscreen carries Mellanox model string MCX512F-ACHT. Under system diagnostic tools and iLO 5/6, it identifies as 'HPE Ethernet 10/25Gb 2-port MCX512F-ACHT Adapter' running HPE digitally validated firmware.

Buying used

When buying second-hand P10112-B21 adapters, check the SFP28 connector shielding for bent grounding fingers or internal pin damage. Confirm whether the card includes both full-height and half-height brackets. Power the adapter in a test server to ensure that Mellanox firmware tools (mstflint or mlxup) and HPE iLO detect both physical MAC addresses without thermal throttling or PCI bus initialization faults.

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

New: USD 375 (1 sighting, Oct 2026)

Refurbished: USD 185 (1 sighting, Oct 2026)

All sightings
SellerConditionPriceNoteSeen
serversupply.comnewUSD 375New factory sealed retail option kit2026-10-27
globalonetechnology.comrefurbishedUSD 185Refurbished unit, clean Mellanox firmware2026-10-27

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

Fits these models

Works together

How the HPE P10112-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 P10112-B21.

Equivalent part numbers

FAQ

Does P10112-B21 support hardware RoCE v2 and RDMA?

Yes, Mellanox ConnectX-5 provides native hardware support for RoCE v1, RoCE v2, and GPUDirect RDMA with low latency and high message rates.

Can P10112-B21 operate in PCIe Gen4 slots?

Yes, it is fully backward and forward compatible with PCIe 3.0, 4.0, and 5.0 physical slots, operating at PCIe 3.0 x8 interface signaling.

Buying or selling P10112-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