IBM CS821 Service Manual page 44

Figure 26. Replacing the PCIe riser
4. Using your labels, replace any cables and plugs that you removed from the adapters.
5. Plug the GPU power cable into the system backplane as shown in Figure 27. Ensure that the cable
latch clip snaps into place on the connector.
Figure 27. Plugging the GPU power cable into the system backplane
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Power Systems: Servicing the IBM Power System S821LC (8001-12C) or the IBM CS821 (8005-12N)