Fujitsu PRIMERGY TX2550 M5 Upgrade And Maintenance Manual page 423

Removing the CPU
Figure 274: Removing the CPU frame
▶ Release the four hooks (see circles).
▶ Carefully twist the CPU back and forth to detach the CPU frame from the
heat sink.
This may be necessary due to the adhesive quality of the thermal
paste located between the heat sink and CPU.
TX2550 M5 Upgrade and Maintenance Manual
Processor (CPU)
423