Fujitsu PRIMERGY BX620 S4 Options Manual page 27

Processors
Figure 12: Fastening the processor heat sink
Ê Place the heat sink on the CPU and fix it by fastening the four premounted
screws in diagonally opposite sequence.
V
CAUTION!
If you do not add a second CPU to the server blade, a dummy heat sink
must be installed in the second CPU socket to make sure that all server
blade modules are cooled sufficiently.
To install the dummy heat sink, follow the procedure for removing it in
reverse, see
BX620 S4
page 22.
Options Guide
Installing a Second Processor
27