Fujitsu PRIMERGY RX4770 M5 Upgrade And Maintenance Manual page 376

Liquid cooling (LC)
Adhesive memory pads
Figure 208: Adhesive memory pads
Figure 209: Assembly rules for the adhesive memory pads
All sides of the memory modules that point to a cooling fin (see arrows) of a
memory cooling unit (1) must be covered with an adhesive memory pad, see
figure above.
376 Upgrade and Maintenance Manual RX4770 M5