IBM System x3550 M4 Installation And Service Manual page 109

Figure 72. Thermal grease
a. Remove the plastic protective cover from the bottom of the heat sink.
b. Position the heat sink over the microprocessor. The heat sink is keyed to
assist with proper alignment.
Figure 73. Heat sink installation
c. Align and place the heat sink on top of the microprocessor in the retention
bracket, thermal material side down.
d. Press firmly on the heat sink.
e. Rotate the heat sink retention module release lever to the closed position
and hook it underneath the lock tab.
11. If you installed the second microprocessor, install the fourth and sixth fans
(see "Replacing a hot-swap fan" on page 267).
Results
If you have other devices to install or remove, do so now. Otherwise, go to
"Completing the installation" on page 96.
Chapter 2. Installing optional devices
91