NVIDIA Mellanox MCX631102AE-ADAT ConnectX-6 Lx EN, Dual-Port 25GbE SFP28, PCIe 4.0 x8, Tall Bracket, Crypto-Enabled: This is a standard PCIe edge ConnectX-6 Lx EN adapter with two SFP28 ports for 25GbE Ethernet. NVIDIA P/N is 900-9X662-0063-ST0. The card includes a hardware crypto engine for IPsec and TLS offload but does not include Secure Boot. The bracket is full-height (Tall) only. This is the standard PCIe edge variant; not OCP 3.0. This is a refurbished unit.
Engineering Context
The ConnectX-6 Lx ASIC delivers PCIe Gen4 x8 host bandwidth, sufficient to drive both SFP28 ports at line rate without PCIe over-subscription. Crypto offload removes the IPsec/TLS CPU tax for VPN gateways and TLS-terminating front-ends. RoCEv2 and NVMe-oF support enable lossless RDMA on Ethernet fabrics. The card supports SR-IOV with up to 1K virtual functions for VM passthrough (firmware-dependent). The 'AE' suffix indicates crypto-enabled silicon; 'T' indicates the standard PCIe edge tall-bracket form factor.
Deployment & Use Cases
Enterprise virtualization hosts running VMware vSphere, Hyper-V, KVM/Proxmox with SR-IOV pass-through. Hyperconverged infrastructure (HCI) storage clusters using vSAN or Ceph with RoCEv2. NVMe-oF target and initiator nodes at 25GbE. TLS-terminating load balancers and IPsec VPN concentrators. Kubernetes worker nodes requiring high-performance container networking with Multus.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX631102AE-ADAT (NVIDIA P/N: 900-9X662-0063-ST0)
Family: ConnectX-6 Lx EN
Port Configuration: Dual SFP28
Data Rate: 25GbE per port
Host Interface: PCIe 4.0 x8 (backward compatible with PCIe 3.0 x8)
Form Factor: Standard PCIe Edge Card
Bracket: Tall (Full-Height) only
Crypto: Enabled (in-line IPsec and TLS offload)
Secure Boot: Not supported on this SKU
Offloads: RoCEv2, NVMe-oF, SR-IOV, GENEVE/VXLAN encap
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Requires a standard PCIe Gen3 x8 or Gen4 x8 (or wider) edge slot in a full-height server chassis. The bracket is tall only; no low-profile bracket is included with this SKU. Compatible with NVIDIA Spectrum 25GbE switches and any 25GbE switch supporting standard SFP28 DAC and optics. Compatible drivers exist for VMware ESXi 7/8, RHEL 8/9, Ubuntu 20.04/22.04, Windows Server 2019/2022. This SKU does NOT support Secure Boot; deployments mandating authenticated firmware boot must use a different SKU.
Why TES
T.E.S IT-SOLUTIONS validates each card on a Gen4 host with both SFP28 ports under load before shipment, and inspects the bracket and connectors. See T.E.S IT-SOLUTIONS for sizing guidance and driver compatibility. Handling time is 1–3 business days.
Frequently Asked Questions
What host interface does the MCX631102AE-ADAT have?
The MCX631102AE-ADAT host interface is PCIe 4.0 x8 (backward compatible with PCIe 3.0 x8), as listed in the specifications for MCX631102AE-ADAT.
What is the MCX631102AE-ADAT NOT compatible with?
The card includes a hardware crypto engine for IPsec and TLS offload but does not include Secure Boot. Confirm fitment against your platform before ordering MCX631102AE-ADAT.
What condition is the MCX631102AE-ADAT supplied in, and who sells it?
The MCX631102AE-ADAT is supplied in Refurbished condition by T.E.S IT-SOLUTIONS from EU stock, with 1-3 business day handling and worldwide B2B shipping. See https://www.tes-itsolutions.com/product-page/connectx-6-mellanox-mcx631102ae-adat-25gbe-dual-sfp28-pcie-4-0-x8.