Lenovo ThinkSystem SR670 V2 - Page 70

Four PCIe x16 slot switched PCIe distribution board
See this section to locate the connectors on the GPU distribution board.
Figure 24. Four PCIe x16 slot switched PCIe distribution board
1 PCIe slots for GPU
2 MCIO connectors A to D
A B Uplink 2
C D Uplink 1
3 Power connector
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ThinkSystem SR670 V2 Maintenance Manual