Dell 06CWFF — Mellanox ConnectX-4 Lx OCP 25GbE Single SFP28 PCIe3 x8
Technical Identity
Dell OEM Mellanox ConnectX-4 Lx EN OCP 2.0 mezzanine adapter (Dell PN 06CWFF): single 25GbE SFP28 port, PCIe 3.0 x8 host interface, host management (NC-SI) enabled, no bracket, RoHS R6 compliant. Engineered for high-density Dell PowerEdge rack and blade servers that require SFP28 25GbE without consuming a standard PCIe add-in slot. Hardware offloads include RoCE v2, NVMe-oF target/initiator, SR-IOV, VXLAN, GENEVE, NVGRE and overlay-network acceleration. Ethernet only (Lx ASIC) — no InfiniBand support. Condition: Refurbished Grade A.
Specifications

Brand: Dell (OEM Mellanox ConnectX-4 Lx)
Dell Part Number: 06CWFF
ASIC: Mellanox ConnectX-4 Lx
Ports: 1× 25GbE SFP28
Backward speed: 10GbE auto-negotiation
Host interface: PCIe 3.0 x8
Form factor: OCP 2.0 mezzanine
Management: Host management (NC-SI sideband)
Bracket: No bracket (mezzanine card)
Compliance: RoHS R6
Protocol: Ethernet only (Lx ASIC)
Hardware offloads: RoCE v2, NVMe-oF, SR-IOV, VXLAN, GENEVE, NVGRE, overlay acceleration
Condition: Refurbished Grade A

What This Is NOT

NOT a PCIe add-in card. OCP 2.0 mezzanine form factor — no bracket, requires a dedicated OCP slot in the host server.
NOT dual-port. Single SFP28 port only; for dual-port 25GbE OCP use ConnectX-4 Lx dual-port variants.
NOT InfiniBand. Ethernet-only Lx ASIC. For dual-protocol VPI EN/IB use the non-Lx ConnectX-4 / ConnectX-5 / ConnectX-6 VPI families.
NOT 40 / 50 / 100GbE. Tops out at 25GbE SFP28; for 50GbE OCP use ConnectX-4 / ConnectX-5; for 100GbE use ConnectX-5 / ConnectX-6 QSFP28.
NOT supplied with SFP28 transceivers, DAC cables or AOC cables — order separately.

Compatibility
Server platforms: Dell PowerEdge rack servers with an OCP 2.0 mezzanine slot — R640, R740, R740xd, R840, R940, R7415, R7425, and other OCP-capable PowerEdge generations. Dell OEM firmware is generally locked to Dell servers; use in third-party servers is possible but not guaranteed.
Switch pairing (sold separately): NVIDIA Spectrum / Spectrum-2 25GbE Ethernet switches (SN2010, SN2410, SN2700, SN3420, SN3700), Cisco Nexus 9000 series, Arista 7050X / 7060X, Dell PowerSwitch S5212F-ON / S5224F-ON / S5248F-ON, HPE FlexFabric / Aruba CX 8325.
Transceivers and cables (sold separately): 25GbE SFP28 SR optics, SFP28 passive DAC (e.g. MCP2M00-A0xx series), SFP28 active AOC (e.g. MFA2P10-Axxx series). Backward-compatible with SFP+ 10GbE DAC and optics for mixed-speed fabrics.
Operating systems: RHEL / CentOS / Rocky 7.x–9.x, Ubuntu 18.04–22.04 LTS, SLES 12 / 15, Windows Server 2016 / 2019 / 2022, VMware ESXi 6.7 / 7.0 / 8.0 (Dell-customized ESXi image recommended for full inbox driver support).
Frequently Asked Questions (FAQ)
Q. What is the Dell 06CWFF?
Dell OEM Mellanox ConnectX-4 Lx OCP 2.0 mezzanine adapter: single 25GbE SFP28 port, PCIe 3.0 x8, host management, no bracket, RoHS R6 compliant, designed for PowerEdge servers with OCP slot.
Q. Is 06CWFF a PCIe add-in card?
No — it is an OCP 2.0 mezzanine card with no bracket. It requires a dedicated OCP slot in the server and cannot be inserted in a standard PCIe slot.
Q. Is 06CWFF InfiniBand capable?
No — Ethernet only (ConnectX-4 Lx ASIC). For dual-protocol VPI EN/IB, see the non-Lx ConnectX-4 (e.g. MCX4131A-BCAT, MCX455A-FCAT) or ConnectX-5 / ConnectX-6 VPI variants.
Q. Can 06CWFF be used in non-Dell servers?
Possibly — OCP form factor is broadly compatible, but Dell OEM firmware may limit features or require specific server BIOS settings. Verify OCP slot revision and firmware before deployment.
Q. What condition does T.E.S IT-SOLUTIONS supply?
Refurbished Grade A — EEPROM-verified, link-tested at 25GbE, cosmetically inspected, shipped from EU stock with multi-currency invoicing and worldwide express delivery.
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.