Dell 06256K Mellanox ConnectX-3 Dual-Port 10GbE QSFP Mezzanine Card (Lot of 11): This is a lot of 11 refurbished dual-port 10 Gigabit Ethernet mezzanine cards identified by Dell P/N 06256K and built on the Mellanox ConnectX-3 ASIC. The card is a Dell PowerEdge M-series blade mezzanine adapter with two QSFP physical interfaces operating at 10 GbE. This is NOT a standard PCIe slot adapter and NOT a stand-alone NIC for tower or rack servers; it is a Dell blade mezzanine card. All 11 units are sold Refurbished, professionally tested by T.E.S IT-SOLUTIONS.
Engineering Context
The 06256K is a mezzanine adapter for Dell PowerEdge blade chassis, mounting on the blade server's mezzanine connector and routing through the Dell M-series chassis fabric to the chassis I/O modules. The Mellanox ConnectX-3 controller provides standard ConnectX-3 stateless TCP offloads, RoCE v1, and SR-IOV virtualization features. The two QSFP physical interfaces operate at 10 GbE Ethernet for blade fabric uplinks. Power and signaling are sourced through the blade mezzanine connector rather than a discrete PCIe slot.
Deployment & Use Cases
Spare or expansion adapters for Dell PowerEdge M-series blade enclosures (M620, M630, M640, M820, and similar). Replacement of failed mezzanine NICs in existing blade deployments. Bulk supply for data centers consolidating Dell blade chassis to 10GbE networking. Lab or staging fleets that need spare mezzanine cards for testing.
Technical Specifications
OEM: Dell
Dell P/N: 06256K
Underlying Controller: Mellanox ConnectX-3
Product Line: ConnectX-3
Form Factor: Dell Blade Mezzanine
Number of Ports: 2
Connector: QSFP
Line Rate: 10 GbE per port
Host Interface: PCI Express 3.0
RDMA: RoCE v1 (ConnectX-3 family)
Quantity: Lot of 11
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible with Dell PowerEdge M-series blade servers that accept the corresponding mezzanine slot — verify your specific blade model and slot type (Mezz Fabric B or C) before deployment. Will NOT install in standard PCIe expansion slots in tower or rack servers; this is a blade-only mezzanine card. Will NOT operate as a stand-alone NIC outside a Dell blade chassis. Firmware is Dell-distributed; non-Dell Mellanox firmware cross-flashing is not supported by the OEM. QSFP cabling is fabric-internal in most Dell blade deployments — verify your chassis I/O modules support 10 GbE on the corresponding fabric.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS specializes in refurbished enterprise networking from NVIDIA Mellanox and OEM-rebadged variants from Dell, HP, IBM, and Lenovo. Each card in this lot is professionally tested by experienced technicians. Browse our refurbished mezzanine and adapter catalog. Standard handling time is 1–3 business days.