Lenovo ThinkSystem SR650 V2 Maintenance Manual page 121

Retimer card
The following shows the cable connections for the 8 x 2.5-inch NVMe configuration with one retimer card.
From
Backplane 1: NVMe 0-1, 2-3
Backplane 1: NVMe 4-5, 6-7
Connections between connectors:
Figure 54. Cable routing for the 8 x 2.5-inch NVMe configuration with one retimer card
To
Onboard: PCIe 1, PCIe 2
Retimer card on PCIe slot 1: C0, C1
↔ ↔ ↔
, , , ...
1 1 2 2 3 3
↔
n n
.
Chapter 3 Internal cable routing
111