CFF 16i RAID/HBA adapter + onboard connectors
The following shows the cable connections for the 8 x 2.5-inch Anybay configuration with one CFF 16i RAID/ 
HBA adapter and onboard connectors.
From To
Backplane 1: SAS CFF 16i RAID/HBA adapter: C0, C1
CFF 16i RAID/HBA adapter: MB Onboard: PCIe 5
CFF 16i RAID/HBA adapter: PWR Onboard: RAID PWR
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 78. SAS/SATA cable routing
Figure 79. NVMe cable routing
128 ThinkSystem SR650 V2Maintenance Manual