NVIDIA Mellanox® MCX623105AN-VDAT — ConnectX-6 Dx EN 200GbE Single-Port QSFP56 PCIe 4.0 x16 Adapter
Technical Identity
The NVIDIA Mellanox® MCX623105AN-VDAT is a single-port 200 Gigabit Ethernet network adapter built on the ConnectX-6 Dx ASIC. It uses a QSFP56 cage, a PCIe 4.0 x16 host interface, and ships in a tall (full-height) bracket. The "AN" suffix denotes the standard SKU with no crypto / no security accelerator (no IPsec / TLS inline encryption). This is the cloud-and-enterprise Ethernet-optimized member of the ConnectX-6 family; it is Ethernet only and does not run InfiniBand.
Specifications
Brand: NVIDIA Mellanox
Model / MPN: MCX623105AN-VDAT
Product type: Ethernet Network Adapter (SmartNIC, ConnectX series)
ASIC: ConnectX-6 Dx
Ports: 1 × QSFP56
Max speed per port: 200 GbE (also 100 / 50 / 40 / 25 / 10 GbE)
Protocol: Ethernet only (no InfiniBand)
Host interface: PCIe Gen 4.0 x16 (also operates at PCIe 3.0)
Bracket: Tall (full-height); low-profile bracket sold separately
Crypto / security: None (use MCX623105AC-VDAT or -CDAT variants for IPsec/TLS inline encryption)
RDMA: RoCE v1 and RoCE v2
Virtualization: SR-IOV, VirtIO acceleration, ASAP² Direct Open vSwitch hardware offload
Tunneling offloads: VXLAN, GENEVE, NVGRE, GRE
Storage offloads: NVMe-oF over RoCE / TCP, T10-DIF / signature handover
Stateless offloads: TSO/LSO, LRO, RSS, checksum, VLAN/QoS
Form factor: Standard PCIe HHHL card
Condition: New
What This Is NOT
NOT an InfiniBand adapter. The Dx EN line is Ethernet only — it does not negotiate IB (HDR / EDR / NDR). For InfiniBand at 200 Gb/s use ConnectX-6 VPI (e.g., MCX653105A-HDAT) or ConnectX-7.
NOT a crypto-enabled SKU. "AN" = no inline IPsec / TLS acceleration. If hardware-offloaded encryption is required, select the "AC" or "CDAT" variants of the same card.
NOT a dual-port card. The "5" in "MCX623105" denotes a single-port (1-port) configuration. Dual-port 200GbE is MCX623106AN-CDAT.
NOT a low-profile-only card. Factory-fitted bracket is tall; the low-profile bracket must be ordered separately if required.
NOT OSFP / QSFP-DD / QSFP+ compatible. Cage is QSFP56 only.
NOT a BlueField DPU. No on-card Arm cores — this is a standard ConnectX SmartNIC, not a programmable DPU.
NOT bundled with transceivers, DACs/AOCs, or rail kits — adapter sold standalone.
Compatibility & Constraints
Host: any server with a PCIe 4.0 x16 slot. Will fall back to PCIe 3.0 x16 (limits effective bandwidth — confirm before deploying single-port 200GbE on Gen 3 hosts).
Switches (head-end): NVIDIA Spectrum-2 (SN3700 / SN3700C — 200 GbE QSFP56) or Spectrum-3 (SN4700 — 400 GbE QSFP-DD, with QSFP56 break-out on supported ports). Any standards-compliant 200 GbE / 100 GbE / 25 GbE Ethernet switch with QSFP56 (or QSFP56 via QSFP-DD break-out) is supported.
Cabling: NVIDIA / Mellanox 200 GbE QSFP56 DACs (MCP1650-V*), 200 GbE QSFP56 AOCs (MFA1A00-C*), 200G QSFP56 transceivers (MMA1T00-VS). 100GbE QSFP28 DAC/AOC pairs at 100 GbE auto-neg.
OS / drivers: RHEL / CentOS / Rocky / Ubuntu / SLES via MLNX_OFED or in-box mlx5 drivers; Windows Server via WinOF-2; VMware ESXi via nmlx5; supported on FreeBSD.
Firmware: verify firmware version against NVIDIA's release notes for your driver / OS combo before production.
Cooling: requires server-direction airflow; confirm chassis airflow direction matches the card SKU.
Compatibility note: typical pair-with components such as Spectrum switches and QSFP56 cables are compatibility partners, not part of this product.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX623105AN-VDAT?
The MCX623105AN-VDAT is a single-port 200 Gigabit Ethernet network adapter built on the NVIDIA ConnectX-6 Dx ASIC, with one QSFP56 cage, a PCIe 4.0 x16 host interface, and a tall bracket. It is Ethernet only and does not include inline crypto.
Q. Does the MCX623105AN-VDAT support InfiniBand?
No. The ConnectX-6 Dx EN family — including the MCX623105AN-VDAT — is Ethernet only. For 200 Gb/s InfiniBand HDR use a VPI variant such as the MCX653105A-HDAT (ConnectX-6 VPI) or a ConnectX-7 / Quantum-2 NDR adapter.
Q. What connector and speeds does the MCX623105AN-VDAT use?
It uses one QSFP56 port and supports 200, 100, 50, 40, 25, and 10 GbE. It will not fit OSFP, QSFP-DD, SFP+, or SFP28 cages directly; QSFP28 100GbE optics and DACs are accepted in the QSFP56 cage at 100 GbE.
Q. What switches and cables pair with the MCX623105AN-VDAT?
Typical head-end switches: NVIDIA Spectrum-2 SN3700 / SN3700C (200GbE QSFP56) or Spectrum-3 SN4700 (400GbE QSFP-DD with QSFP56 break-out). Cabling: 200G QSFP56 DACs, AOCs, or MMA1T00-VS QSFP56 optics. Any vendor's standards-compliant 200 GbE / 100 GbE Ethernet switch with a QSFP56 / QSFP-DD port is supported.
Q. Does the MCX623105AN-VDAT support RoCE, SR-IOV, and Open vSwitch offload?
Yes. The card supports RoCE v1 and v2 (lossless RDMA over Ethernet), SR-IOV with VirtIO acceleration, and ASAP² Direct hardware-accelerated Open vSwitch. It also offloads VXLAN / GENEVE / NVGRE tunneling and NVMe-oF over RoCE or TCP.
Q. What is the difference between MCX623105AN-VDAT, AC-VDAT, and CDAT variants?
"AN" = no crypto (this SKU). "AC" = adds IPsec and TLS inline encryption. "CDAT" suffix on related part numbers (e.g., MCX623106AN-CDAT) denotes a dual-port 100GbE configuration. Match the suffix to your security and port-count requirements.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
This unit is supplied New in factory packaging. All units ship from EU stock with professional anti-static packaging and global B2B shipping. Technical consultation for HPC / AI / cloud fabric design is included at no extra cost.
Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based NVIDIA Mellanox specialist serving HPC, AI, and enterprise data-center procurement teams since 2007. Every unit is identified by MPN, NVIDIA P/N, and ASIC generation before it ships, and every customer gets free pre-sale compatibility advice for switch / adapter / cable pairing. Multi-currency B2B invoicing, EU stock with worldwide express options, and direct technical contact with our engineering team — not a call-center.