Onboard connectors
The following shows the cable connections for the 8 x 2.5-inch NVMe configuration with onboard 
connectors.
From To
Backplane 1: NVMe 0-1, 2-3
Onboard: PCIe 1, PCIe 2
Backplane 1: NVMe 4-5, 6-7 Onboard: PCIe 3, PCIe 4
Connections between connectors: 
1  ↔  1 ,  2  ↔  2 ,  3  ↔  3 , ...  n  ↔  n
Figure 53. Cable routing for the 8 x 2.5-inch NVMe configuration with onboard connectors
110 ThinkSystem SR650 V2Maintenance Manual