Lenovo ThinkSystem SR645 V3 User Manual page 178

Cable routing for onboard configuration with one processor
The following table shows the mapping relationship between backplane connectors and system board
connectors for onboard configuration.
The following figure illustrates the cable routing for the onboard configuration of 4 x 2.5-inch front NVMe
drive bays. Connections between connectors:
Figure 120. Cable routing for onboard configuration of 4 x 2.5-inch front NVMe drive bays with one processor
Table 20. Mapping between backplane connectors and system board connectors for onboard configuration
From
NVMe 0–1, NVMe 2–3 on front backplane
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↔ ↔ ↔
, , , ...
1 1 2 2 3 3
To
PCIe 7, PCIe 8, PCIe 9 on on the system board (system
board assembly)
↔
n n