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P31324-B21: HPE Ethernet 100Gb 2-port QSFP56 MCX623106AS-CDAT Adapter

HPE P31324-B21 Network adapterPCIe 4.0 x16100GbEStandup PCIe card with s
HPENetwork adaptersPCIe 4.0 x16

Also listed as: P31868-001, P31321-001, MCX623106AS-CDAT, CX6-Dx-100G · made by Mellanox

The HPE Ethernet 100Gb 2-port QSFP56 MCX623106AS-CDAT Adapter (P31324-B21) is a high-bandwidth enterprise network interface card based on the NVIDIA Mellanox ConnectX-6 Dx ASIC. Operating over a PCIe 4.0 x16 bus, it delivers 200 Gbps of aggregate switching throughput across two 100GbE QSFP56 ports. Designed for all-NVMe storage arrays such as HPE Alletra Storage MP, AI training clusters, and big data pipelines, it features hardware-accelerated RoCE v2, ASAP2 virtual switch acceleration, and inline IPsec/TLS encryption. Pre-owned buyers should verify optical port integrity and check firmware status in iLO.

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Specifications

Part numberP31324-B21
BrandHPE
Made byMellanox
TypeNetwork adapters
Other numbersP31868-001, P31321-001, MCX623106AS-CDAT, CX6-Dx-100G
Statuscurrent
InterfacePCIe 4.0 x16
Form factorStandup PCIe card with standard and low-profile brackets
Ports2x 100GbE QSFP56 optical ports (also supports QSFP28)
Speed100GbE, 50GbE, 40GbE, and 25GbE auto-negotiation
Generation fitHPE ProLiant Gen10 Plus and Gen11 servers

About the P31324-B21

P31324-B21 is HPE's dual-port 100GbE QSFP56 network adapter driven by the NVIDIA Mellanox ConnectX-6 Dx controller over PCIe 4.0 x16. Built for NVMe-over-Fabrics storage, distributed AI computing, and cloud virtualization, it provides ultra-low latency, hardware-accelerated RoCE v2, ASAP2 vSwitch offload, and inline IPsec cryptography.

Compatibility

Qualified on HPE ProLiant Gen10 Plus and Gen11 rack servers including DL380 Gen10 Plus, DL380 Gen11, and DL360 Gen11. Requires a PCIe 4.0 x16 slot for full bandwidth. Connects to 100GbE spine/leaf switches such as HPE Aruba CX 8325 and pairs with HPE Alletra Storage MP disaggregated NVMe-oF storage nodes.

How to identify a genuine unit

The card features two QSFP56 cages and an extensive passive heatsink covering the Mellanox ConnectX-6 Dx ASIC. The HPE barcode label indicates option part number P31324-B21, spare part number P31868-001, and assembly P31321-001. OS utilities report Mellanox vendor ID 15B3 and HPE subsystem vendor ID 103C.

Buying used

Inspect both QSFP56 optical cages for bent internal pins or debris. Confirm that the heatsink is tightly anchored and that thermal pads have not deteriorated. Verify in HPE iLO that the adapter initializes with valid MAC addresses and updates cleanly via HPE SUM.

Reference prices (last 12 months, updated 2026-10-27)

Used: USD 495 (1 sighting, Oct 2026)

All sightings
SellerConditionPriceNoteSeen
serversupply.comusedUSD 495Tested dual-port 100GbE QSFP56 PCIe adapter with bracket2026-10-27

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

Fits these models

Works together

How the HPE P31324-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 P31324-B21.

Equivalent part numbers

FAQ

What spare part number corresponds to the P31324-B21 adapter?

The HPE spare part number is P31868-001, corresponding to board assembly P31321-001.

Does this adapter support NVMe-oF over RoCE and TCP?

Yes, ConnectX-6 Dx hardware provides line-rate hardware offloads for both NVMe/RoCE and NVMe/TCP.

Buying or selling P31324-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