Lenovo ThinkSystem SR635 V3 User Manual page 278

Figure 198. Cable routing for NVMe onboard configuration of 6 front SAS/SATA drives and 4 front AnyBay drive bays
Table 39. Mapping between one front AnyBay backplane and system board assembly for NVMe onboard configuration
From
NVMe 0-1 and 2-3 on the front backplane
1
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To
PCIe connectors 4 and 3 on the system board
1
assembly