Fujitsu PRIMERGY RX4770 M6 Upgrade And Maintenance Manual page 218

Expansion cards and backup units
▶ Connect the GPU PWR cable to the bottom system board.
Notice the routing of the GPU PWR cable:
Installing a GPU card (example RTX4000/6000/8000)
Figure 122: Connecting the GPU power cable
▶ Connect the power cable to the GPU.
218 Upgrade and Maintenance Manual RX4770 M6