Dell 06XJXK — Mellanox ConnectX-6 Lx Dual-Port 25GbE SFP28 Network Adapter
Technical Identity
Dell OEM NVIDIA Mellanox ConnectX-6 Lx EN network adapter (Dell PN 06XJXK): dual-port 25GbE SFP28, PCIe 4.0 x8, low-profile / full-height bracket configurable. Built on the ConnectX-6 Lx ASIC (Ethernet-only Lx variant — not VPI / not InfiniBand). RoCE v2, NVMe-oF over TCP and RoCE, VXLAN / NVGRE / Geneve overlay offload, SR-IOV with up to 1K virtual functions, ASAP² hardware acceleration for OVS. Dell PowerEdge qualified firmware. Condition: Refurbished Grade A, EEPROM-verified and link-tested in EU.
Specifications

Brand / OEM: Dell (OEM NVIDIA Mellanox ConnectX-6 Lx EN)
Dell P/N: 06XJXK
ASIC: ConnectX-6 Lx (Ethernet-only Lx ASIC)
Ports: 2× 25GbE SFP28 (also supports 10GbE / 1GbE per-port)
Host interface: PCIe 4.0 x8 (backward compatible with PCIe 3.0)
Form factor: Low-profile PCIe card with full-height bracket option
Offloads: RoCE v2, NVMe-oF, VXLAN / NVGRE / Geneve, SR-IOV, ASAP², TCP/UDP/IP stateless offloads, IPsec inline crypto
Qualification: Dell PowerEdge (firmware locked to Dell ID)
Condition: Refurbished Grade A — EU stock

What This Is NOT

NOT InfiniBand. Lx is an Ethernet-only ASIC — no IB, no VPI dual-protocol mode.
NOT 50GbE or 100GbE. Maximum is 25GbE per port (50GbE aggregate).
NOT a retail NVIDIA card. Dell OEM with PowerEdge-locked firmware — verify host platform support before deploying outside PowerEdge.
NOT supplied with SFP28 transceivers, DAC / AOC cables, or low-profile / full-height bracket swap kits.

Compatibility

Hosts: Validated for Dell PowerEdge servers with PCIe 4.0 x8 (or 3.0 x8) slots. Non-Dell hosts may flag firmware mismatch — confirm against Dell support matrix.
Switch pairing: Pairs with 25GbE SFP28 ToR switches — NVIDIA Spectrum / Spectrum-2 (e.g., SN2410, SN2010), Cisco Nexus 93180YC-FX, Arista 7280SR / 7050SX3, Dell PowerSwitch S5200-ON. Auto-negotiates 10GbE for legacy ports.
Cabling: SFP28 DAC (passive 1–3 m or active to 5 m), SFP28 AOC, or SR / LR optical transceivers. Sold separately.
OS / drivers: Inbox drivers on RHEL 8/9, SLES 15, Ubuntu 20.04 / 22.04, VMware ESXi 7.x / 8.x, Windows Server 2019 / 2022. NVIDIA MLNX_OFED / DOCA / WinOF-2 stacks supported.

Frequently Asked Questions (FAQ)
Q. What is the Dell 06XJXK?
Dell OEM Mellanox ConnectX-6 Lx EN network adapter — dual-port 25GbE SFP28, PCIe 4.0 x8. Ethernet-only Lx ASIC with RoCE v2, NVMe-oF, SR-IOV, and ASAP².
Q. Is the 06XJXK InfiniBand capable?
No. The ConnectX-6 Lx is an Ethernet-only ASIC — no InfiniBand and no VPI dual-protocol mode.
Q. Can the 06XJXK be used in non-Dell servers?
Sometimes. Dell OEM firmware is PowerEdge-qualified and may flag a vendor ID mismatch in non-Dell platforms. Verify against the target server vendor's HCL before deploying.
Q. What switches pair with the 06XJXK?
Any 25GbE SFP28 switch — NVIDIA Spectrum / Spectrum-2, Cisco Nexus 9300, Arista 7050SX3 / 7280SR, Dell PowerSwitch S5200-ON. SFP28 auto-negotiates to 10GbE for mixed fleets.
Q. What condition does T.E.S IT-SOLUTIONS supply?
Refurbished Grade A — EEPROM-verified, link-tested, cosmetically inspected, shipped from EU stock in anti-static packaging.
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 NICs, switches, and interconnects. Every unit is MPN-identified, EEPROM-verified, and link-tested before leaving our EU warehouse. Multi-currency B2B invoicing, worldwide express shipping, and free pre-sale compatibility consultation for switch / adapter / cable pairing are included — talk directly to engineering, not a call center.