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.
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 258).
Results
If you have other devices to install or remove, do so now. Otherwise, go to
“Completing the installation” on page 92.
Thermal grease
The thermal grease must be replaced whenever the heat sink has been removed
from the top of the microprocessor and is going to be reused or when debris is
found in the grease.
Figure 72. Thermal grease
Figure 73. Heat sink installation
88 System x3550 M4 Type 7914: Installation and Service Guide
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