Fujitsu PRIMERGY RX4770 M5 Upgrade And Maintenance Manual page 276

Processor (CPU)
Figure 147: Installing the CPU frame on the heat sink (A)
▶ Position the CPU frame on the heat sink. Ensure that the triangle marks on
heat sink and on CPU frame are on the same edge (see circles).
CPU H/S top side: the arrow marks the number 1 screw location.
276 Upgrade and Maintenance Manual RX4770 M5