Your SR650 V2 has the slots but not the riser to reach them, and you're trying to drop in a GPU, a NIC, or a RAID controller that needs PCIe Gen4 lanes. This is the x8/x8 Riser3 option kit that gives you two full-width x8 slots on PCIe 4.0, wired straight through to the platform. No lane-splitting workarounds. No Gen3 fallback eating your bandwidth. You seat the riser, plug in your card, and the full Gen4 throughput is live. If you're running inference workloads, a high-speed storage controller, or a dual-port 25GbE NIC in a local server room, this is the piece that makes the spec sheet match reality
| brand | Lenovo ISG |
| category | Servers |
| subcategory | Lenovo RAID Cards |
| server_model | ThinkSystem SR650 V2 |
| pcie_generation | 4 |
| lane_configuration | x8/x8 |
| riser_position | Riser3 |
| kit_type | Option Kit |