Dell PowerEdge M620 Owner's Manual page 260

For PowerEdge M910, tighten the screw securing the processor shield.
d
For other blades, rotate the socket release lever down until it snaps
into place, securing the processor.
3 Install the heat sink:
If you are reinstalling a heat sink, use a clean, lint-free cloth to remove
a
the existing thermal grease from the heat sink.
If you are upgrading a processor and a new heat sink was supplied with
the processor, install the new heat sink.
If you are reinstalling a processor, also clean any remnants of thermal
grease from the processor.
Apply thermal grease evenly to the top of the processor.
b
Place the heat sink onto the processor.
c
The heat sink must match the orientation shown in Figure 3-40
(PowerEdge M915), Figure 3-41 (PowerEdge M910), Figure 3-42
(PowerEdge M905), Figure 3-43 (PowerEdge M805), Figure 3-44
(PowerEdge M710), Figure 3-45 (PowerEdge M710HD), Figure 3-46
(PowerEdge M610), Figure 3-47 (PowerEdge M610x), Figure 3-48
(PowerEdge M600), or Figure 3-49 (PowerEdge M605).
NOTE:
heat sink. To prevent over-tightening, tighten the retention screw until
resistance is felt, and stop once the screw is seated. The screw tension
should be no more than 6 in-lb (6.9 kg-cm).
Carefully tighten the four screws to secure the heat sink to the blade
d
board.
4 Close the blade. See "Closing the Blade" on page 161.
5 Install the blade. See "Installing a Blade" on page 158.
As the system boots, it detects the presence of the new processor and
automatically changes the system configuration information in the System
Setup program.
6 Press <F2> to enter the System Setup program, and check that the processor
information matches the new system configuration.
See "Using the System Setup Program and UEFI Boot Manager" on
page 137 for instructions about using the System Setup program.
260
Installing Blade Components
Do not over-tighten the heat sink retention screws when installing the