Dell PowerEdge XE9640 Installation And Service Manual page 220

Steps
1. Here is the orientation image for removal and installation sequence of liquid cooling tubes for processor, PSB cold plate, GPU
cold plates.
Figure 233. Removal and installation sequence of liquid cooling tubes for processor, PSB cold plate, GPU cold
plates
2. Unplug the cold plate tubes numbering with 3 and 6 from the Manifold Liquid cooling. Using the Torx 15, remove the screws
securing the PCIe switch board (PSB) cold plate from the PSB. Lift the PSB cold plates from the PSB.
Figure 234. Removing the PCIe switch board cold plate
220 Installing and removing system components