Fujitsu PRIMERGY TX1310 M5 Upgrade And Maintenance Manual page 136

Processor (CPU)
Removing the heat sink
Figure 79: Removing the heat sink (A)
▶ Disconnect the CPU fan cable from system board connector "Fan (CPU)"
Figure 80: Removing the heat sink (B)
▶ Loosen the four captive screws on the heat sink in a crossover pattern (1-4).
136 Upgrade and Maintenance Manual TX1310 M5