Fujitsu PRIMERGY RX4770 M6 Upgrade And Maintenance Manual page 288

Liquid cooling (LC)
Figure 173: Assembling the LC kit (A)
▶ Remove the heat sink from the protective cover.
▶ Place the heat sink onto the CPU frame.
▶ Ensure that the triangle mark on the CPU frame and the LC heat sink are on
the same edge (see circle).
288 Upgrade and Maintenance Manual RX4770 M6