NVIDIA Mellanox MCX623105AN-CDAT - ConnectX-6 Dx 100GbE Single QSFP56 PCIe 4.0 x16 (Refurbished)
Technical Identity
The NVIDIA Mellanox MCX623105AN-CDAT is a ConnectX-6 Dx Ethernet network adapter (HCA). It provides up to 100 Gb/s Ethernet on a single QSFP56 port, with a PCIe 4.0 x16 host interface that supplies full bandwidth headroom (no PCIe oversubscription at 100GbE). The card uses 50G PAM4 SerDes and is built around the ConnectX-6 Dx ASIC, NVIDIA's hardened SmartNIC silicon for cloud, storage, and AI/ML fabrics. Suffix decode: -AN = No Crypto / Secure Boot disabled, -CDAT = 100GbE single QSFP56, tall bracket. Condition: Refurbished, EU stock.
Specifications
Brand: NVIDIA Mellanox
MPN: MCX623105AN-CDAT
Family / ASIC: ConnectX-6 Dx (Ethernet-only Dx silicon)
Product type: Single-port Ethernet Network Adapter (NIC / SmartNIC)
Ports: 1x QSFP56
Supported speeds: 10 / 25 / 50 / 100 Gb/s Ethernet
SerDes: 50G PAM4 (4x 25G NRZ also supported for 100GbE legacy mode)
Host interface: PCIe Gen 4.0 x16 (backward-compatible with PCIe 3.0 x16, no bandwidth ceiling at 100GbE)
Bracket: Tall (full-height); low-profile bracket not included
Cryptography: No Crypto (IPsec / TLS inline crypto offload disabled)
Secure Boot: Disabled
RDMA: RoCE v1 / v2 with hardware congestion control
Storage offloads: NVMe-oF target + initiator, T10-DIF/PI, erasure coding
Network offloads: VXLAN / NVGRE / GENEVE, OVS hardware acceleration (ASAP2 Direct), SR-IOV, hairpin
Acceleration features: GPUDirect RDMA, GPUDirect Storage, hardware time-stamping (no advanced PTP / SyncE on -AN)
Condition: Refurbished - visually inspected, MPN- and bracket-verified, ESD-safe packed
What This Is NOT
NOT an InfiniBand adapter. ConnectX-6 Dx is Ethernet-only silicon. For InfiniBand HDR / 200 Gb/s VPI, see the ConnectX-6 VPI series (MCX65xx).
NOT a dual-port card. Single QSFP56 only. Dual-port equivalent is MCX623106AN-CDAT.
NOT a crypto-enabled SKU. -AN means No Crypto - inline IPsec / TLS offload is disabled. Crypto-enabled equivalent is MCX623105AE-CDAT.
NOT a SyncE / PTP timing card. -CDAT lacks the Enhanced SyncE / PPS I/O of the timing-grade (TN) variants such as MCX623106TN-CDAT.
NOT a low-profile card. Ships with tall bracket only.
NOT bundled with QSFP56 transceivers, DAC, or AOC cables - sold standalone.
Compatibility
Host slot: PCIe 4.0 x16 slot recommended for line-rate 100GbE; PCIe 3.0 x16 works but caps usable throughput around ~110 Gb/s aggregate.
Cabling (not included): any QSFP56-cage 100GbE DAC, 100GbE AOC (e.g., MFA1A00-Cxxx), or 100GbE QSFP56 transceiver (e.g., MMA1T00-VS SR4).
Switch pairing: works with NVIDIA Spectrum / Spectrum-2 / Spectrum-3 Ethernet switches and any standards-compliant 100GbE QSFP28 / QSFP56 switch port (Cisco Nexus, Arista 7000-series, Juniper QFX, etc.).
OS / Drivers: MLNX_OFED, MLNX_EN, or in-tree mlx5 driver (Linux kernel >= 4.15 recommended); WinOF-2 on Windows Server.
Firmware: ConnectX-6 Dx firmware family fw-ConnectX6Dx (latest GA recommended). Always validate firmware/driver pair against your OS vendor matrix before deployment.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX623105AN-CDAT?
The MCX623105AN-CDAT is a single-port ConnectX-6 Dx 100GbE QSFP56 network adapter with PCIe 4.0 x16, No Crypto, tall bracket. It is an Ethernet-only SmartNIC for cloud, storage, and AI/ML servers.
Q. How does MCX623105AN-CDAT differ from MCX623106AN-CDAT?
105 is single-port (1x QSFP56). 106 is dual-port (2x QSFP56). Both are ConnectX-6 Dx 100GbE, PCIe 4.0 x16, No Crypto. Choose single-port for single-switch uplinks; dual-port for LAG, MLAG, failover, or multi-rail storage.
Q. Is the MCX623105AN-CDAT InfiniBand capable?
No. ConnectX-6 Dx is Ethernet-only silicon. For InfiniBand HDR / VPI, choose the ConnectX-6 VPI series (e.g., MCX653105A-HDAT).
Q. What offloads does the MCX623105AN-CDAT support?
RoCE v1 / v2, NVMe-oF (target + initiator), ASAP2 Direct (OVS offload), SR-IOV, VXLAN / NVGRE / GENEVE, GPUDirect RDMA, GPUDirect Storage, T10-DIF/PI. Inline IPsec / TLS crypto is disabled on -AN.
Q. What QSFP56 cables and transceivers work with this card?
Any standards-compliant 100GbE QSFP56 DAC, AOC, or transceiver: NVIDIA MCP1650 DACs, MFA1A00 AOCs, MMA1T00-VS SR4 transceivers, or third-party 100GBASE-SR4 / LR4 / CWDM4 optics.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Visually inspected, MPN- and bracket-verified, ESD-safe packed, EU stock. EOL note: verify driver / firmware support against your OS vendor matrix before deployment.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based NVIDIA Mellanox specialist serving HPC, AI, cloud, and enterprise data-center procurement teams since 2007. Every adapter is identified by MPN, NVIDIA P/N, and ASIC generation before it ships. We offer multi-currency B2B invoicing (EUR / USD / GBP), EU stock with worldwide express logistics, ESD-safe packaging, and free pre-sale compatibility advice for switch / adapter / cable pairing - direct technical contact with our engineering team, not a call center.