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| Class | Feature | ConnectX-3 | ConnectX-3 Pro | ConnectX-4 | ConnectX-4 Lx | ConnectX-5 | ConnectX-6 |
|---|---|---|---|---|---|---|---|
| Interface | Port/Speed options | 2 ports of 10/40/56GbE | 2 ports of 10/40/56GbE | 2 ports of 100/56/50/40/25/10GbE | 2 ports of 10/25GbE 1 port of 40/50GbE |
2 ports of 100/56/50/40/25/10GbE | 2 ports of 200/100/56/50/40/25/10GbE |
| Interface | PCIe | x8 Gen3 | x8 Gen3 | x8, x16 Gen3 | x8 Gen3 | x16 Gen3 x16 Gen4 |
2x Gen3 x16 Gen4 x16 |
| Interface | PCIe Switch | PCIe x16 | PCIe x32 | ||||
| Interface | Coherent Accelerator Processor Interface (CAPI) | - | - | - | - | Supported (v2) | Supported (v2) |
| IB RDMA / RoCE | IB RDMA / RoCE | IB RDMA, RoCE* | IB RDMA, RoCE | IB RDMA, RoCE | RoCE | IB RDMA, RoCE | IB RDMA, RoCE |
| RoCE | RoCE Congestion Control | - | Supported | Supported | Supported | Supported | Supported |
| HPC | CORE-Direct® | Supported | Supported | Supported | Supported | Supported | Supported |
| HPC | PeerDirect® | Supported | Supported | Supported | Supported | Supported | Supported |
| HPC | Dynamically Connected Transport (DCT) | - | - | Supported | Supported | Supported | Supported |
| CPU Offloads | Stateless Ethernet offload | Supported | Supported | Supported + LRO, LSOv2 | Supported + LRO, LSOv2 | Supported + LRO, LSOv2 | Supported + LRO, LSOv2 |
| CPU Offloads | RSS (MAC, VLAN 5 Tuple) | Supported | Supported | Supported + | Supported + | Supported + | Supported + |
| Virtualization | SR-IOV | Supported | Supported | Supported | Supported | Supported | Supported |
| Virtualization | Multi Host | - | - | 4 hosts | 4 hosts | 4 hosts | 8 hosts |
| Open V-Switch (OVS) | OVS Offload | - | - | - | Supported | Supported + | Supported + |
| Overlay Network | Stateless offload | - | Supported | VXLAN / NVGRE / GENEVE | VXLAN / NVGRE / GENEVE | VXLAN / NVGRE / GENEVE and FlexParse | VXLAN / NVGRE / GENEVE and FlexParse |
| Overlay Network (VXLAN/NVGRE) |
Encap/Decap (in HW) | - | - | - | Supported | Supported | Supported |
| Storage | Erasure Coding Offload | - | - | Supported | Supported | Supported | Supported |
| Storage | T10/DIF Signature Handover | - | - | Supported | - | Supported | Supported |
| Storage | NVMe oF Target Offload (also for Burst Buffer) |
- | - | - | - | Supported | Supported + |
| Storage | Host Chaining | - | - | - | - | Supported | Supported |
| Cloud Integration | Mirantis Fuel | Supported Fuel 7.0/8.0 | Supported Fuel 7.0/8.0 | Supported Fuel 8.0 | Supported Fuel 8.0 | Supported | Supported |
| Media & Entertainment | Packet Pacing | - | - | Supported | Supported | Supported | Supported |
| Security | Secure Firmware update | - | - | Supported | Supported | Supported | Supported |
| Security | Secure Boot | - | - | - | - | - | Supported |
* Partial support. Contact Mellanox for details.
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