Dell 071C1T — Mellanox ConnectX-5 Ex Dual-Port 100GbE QSFP28 Adapter
Technical Identity
Dell OEM Mellanox ConnectX-5 Ex EN dual-port 100GbE network adapter (Dell PN 071C1T). PCIe 4.0 x16 host interface, QSFP28 cages, Dell PowerEdge qualified firmware. Delivers RoCE v2, NVMe-oF target/initiator, VXLAN/NVGRE/Geneve hardware offloads, SR-IOV, ASAP² Direct, and OVS offload at 100GbE line rate per port. Condition: Refurbished Grade A, EU stock.
Specifications

Brand / OEM: Dell (OEM NVIDIA Mellanox ConnectX-5 Ex EN)
Dell PN: 071C1T
ASIC: ConnectX-5 Ex (Ex variant = PCIe 4.0 + enhanced SR-IOV)
Ports: 2× 100GbE QSFP28
Protocol: Ethernet only (EN variant — not VPI, not InfiniBand)
Host interface: PCIe 4.0 x16 (backward compatible with PCIe 3.0 x16 at reduced bandwidth)
Form factor: Low-profile PCIe / Dell custom bracket
Hardware offloads: RoCE v2, NVMe-oF, VXLAN/NVGRE/Geneve, SR-IOV (1K VFs), ASAP² Direct, OVS offload, GPUDirect RDMA
Qualification: Dell PowerEdge (R640/R740/R740xd/R7525/R750 and similar)
Condition: Refurbished Grade A — EEPROM-verified, link-tested, cosmetically inspected

What This Is NOT

NOT InfiniBand. EN-only firmware — does not run EDR/HDR InfiniBand.
NOT VPI. Cannot be reflashed to dual-protocol VPI mode.
NOT a standard NVIDIA retail card. Dell OEM firmware — verify behaviour outside Dell PowerEdge before deploying.
NOT supplied with QSFP28 transceivers, DAC/AOC cables, or non-Dell brackets.

Compatibility

Servers: Dell PowerEdge R640, R740, R740xd, R7525, R750 (PCIe 4.0 unlocks full bandwidth; PCIe 3.0 slots work at reduced throughput).
Switches (100GbE): NVIDIA Spectrum / Spectrum-2 (SN2700, SN3700C), Cisco Nexus 9300/9500 with 100GbE QSFP28 line cards, Arista 7050X3/7060X/7280R, Juniper QFX5200/QFX5210.
Transceivers (sold separately): NVIDIA MMA1B00-C100D (100GbE SR4 MMF), MMA1L10-CR (100GbE LR4 SMF), or equivalent QSFP28 SR4/LR4 optics.
Cables (sold separately): NVIDIA MCP1600-C… series passive copper QSFP28 DAC (0.5–3m), or MFA1A00-C… series QSFP28 AOC (3–30m).
OS / drivers: RHEL/Rocky 8/9, Ubuntu 20.04/22.04, ESXi 7/8, Windows Server 2019/2022 — MLNX_OFED 5.x or in-box mlx5 driver.

Frequently Asked Questions (FAQ)
Q. What is the Dell 071C1T?
Dell OEM Mellanox ConnectX-5 Ex EN dual-port 100GbE QSFP28 network adapter. PCIe 4.0 x16, Dell PowerEdge qualified, RoCE v2 and NVMe-oF capable.
Q. Is the 071C1T InfiniBand or VPI capable?
No — EN variant is Ethernet-only and cannot be reflashed to InfiniBand or dual-protocol VPI mode.
Q. What is ConnectX-5 Ex versus standard ConnectX-5?
ConnectX-5 Ex adds PCIe 4.0 x16 (vs PCIe 3.0 on standard ConnectX-5) and enhanced SR-IOV, enabling true 200Gb/s aggregate dual-port throughput on PCIe 4.0 hosts.
Q. Will the 071C1T work in a non-Dell server?
Often yes — it presents as a standard ConnectX-5 Ex EN PCIe device. However Dell OEM firmware may restrict diagnostic features or refuse non-Dell branded SFPs. Always validate firmware behaviour before production deployment.
Q. What condition does T.E.S IT-SOLUTIONS supply?
Refurbished Grade A — every unit is EEPROM-verified, link-tested where bench topology is available, cosmetically inspected, and shipped from EU stock with anti-static packaging and worldwide B2B express options.
Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based data-center networking specialist focused on NVIDIA Mellanox and OEM-equivalent fabric hardware since 2007. Every unit is MPN-identified, EEPROM-verified, and cosmetically inspected before leaving our EU warehouse. Multi-currency B2B invoicing, worldwide express shipping, and free pre-sale technical consultation for adapter ↔ switch ↔ cable pairing included.