Lenovo 03GX412 — ThinkSystem ConnectX-6 Dx 10/25GbE SFP28 2-Port PCIe Adapter
Technical Identity
Lenovo ThinkSystem branded NVIDIA Mellanox ConnectX-6 Dx EN PCIe 4.0 adapter (Lenovo PN 03GX412): dual-port 10/25GbE SFP28, Ethernet-only ASIC. Lenovo ThinkSystem qualified firmware. Hardware-accelerated RoCE v2, NVMe-oF, VXLAN/NVGRE/GENEVE encap-decap, ASAP² Direct OVS offload, SR-IOV, and Inline IPsec/TLS crypto offloads. Condition: Refurbished Grade A, EU stock.
Specifications

Brand: Lenovo (NVIDIA Mellanox ConnectX-6 Dx OEM)
Lenovo PN: 03GX412
ASIC family: ConnectX-6 Dx (EN)
Ports: 2× SFP28 (10GbE or 25GbE per port)
Protocol: Ethernet only (ConnectX-6 Dx is EN — no InfiniBand)
Host bus: PCIe 4.0 x8
Qualification: Lenovo ThinkSystem
Offloads: RoCE v2, NVMe-oF, VXLAN/NVGRE/GENEVE, ASAP² OVS, SR-IOV, Inline IPsec/TLS
Condition: Refurbished Grade A — EEPROM-verified, link-tested

What This Is NOT

NOT InfiniBand. ConnectX-6 Dx is Ethernet-only (EN). For IB use ConnectX-6 VPI or HDR HCAs.
NOT 100GbE / 200GbE. SFP28 caps at 25GbE per port.
NOT a generic retail NVIDIA card. Lenovo OEM firmware — feature-limited outside ThinkSystem servers; verify compatibility before deploying.
NOT supplied with SFP28 transceivers, DAC, or AOC cables — order separately.

Compatibility
Designed and validated for Lenovo ThinkSystem rack/tower servers (SR630/SR650/SR635/SR655/SR645/SR665 generations and successors). Links at 10GbE or 25GbE to NVIDIA Spectrum / Spectrum-2 / Spectrum-3 Ethernet switches, Cisco Nexus, Arista 7000-series, and any standards-compliant SFP28 ToR. Pairs with passive copper DAC (typically 1–5 m), active optical AOC, or SFP28 SR/LR transceivers. Driver support: MLNX_OFED / DOCA-Host, Windows OFED, in-box drivers for RHEL/SLES/Ubuntu and VMware ESXi.
Frequently Asked Questions (FAQ)
Q. What is the Lenovo 03GX412?
ThinkSystem Mellanox ConnectX-6 Dx 10/25GbE SFP28 2-port PCIe Ethernet adapter. Lenovo-qualified. RoCE v2, NVMe-oF.
Q. Does 03GX412 support both 10GbE and 25GbE?
Yes — each SFP28 port configures for 10GbE or 25GbE depending on switch port mode.
Q. Is 03GX412 InfiniBand capable?
No — Ethernet EN only (ConnectX-6 Dx EN).
Q. Can 03GX412 be used in non-Lenovo servers?
Possibly — OEM firmware may limit features. Verify before deploying.
Q. What condition does T.E.S supply?
Refurbished Grade A — EEPROM-verified, link-tested, EU stock.
Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based data-center networking specialist. Every unit is MPN-identified, EEPROM-verified, and cosmetically inspected before leaving our EU warehouse. Multi-currency invoicing, worldwide express shipping, and free pre-sale technical consultation included.