Dell XPS /Dimension Gen 5 Owner's Manual page 111

anchor tabs (3)
shroud release levers (2)
CAUTION:
The heat sink can get very hot during normal operation. Be sure that the heat sink has had
sufficient time to cool before you touch it.
5 Remove the heat sink:
Remove the retention module clips. Press the tabs toward the center of the clip and lift.
a
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Removing and Installing Parts