Dell OptiPlex GX400 - Manual (Page 30)

4. Remove the microprocessor heat sink:
a. For each of the metal clips that secure the heat sink to the microprocessor, press down on the clip's latch to release it from the heat-sink
retention base. Then lift the clip away from the heat sink (see " Removing the Microprocessor Heat Sink ").
b. Lift the heat sink away from the microprocessor.
5. Discard the original microprocessor heat sink and securing clips.
Removing the Microprocessor Heat Sink
6. Remove the microprocessor from its connector.
NOTE: The bottom of the heat sink is covered with thermal grease that conducts heat from the processor to the heat sink. Some of this lubricant
will remain on the bottom of the heat sink when you remove it.
NOTICE: Do not discard the original microprocessor heat sink or securing clips unless you are installing a microprocessor upgrade kit from Dell. If
you are not installing a microprocessor upgrade kit from Dell, reuse the original heat sink and securing clips when replacing the microprocessor.