Gateway FX540 Reference Manual page 82

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CHAPTER 5: Upgrading Your Computer
Remove the fan cover by holding cables out of the way
and pulling the cover away from the computer.
Find the memory module banks on your system board.
Gently pull the plastic tabs away from the sides of the
memory modules, then remove them.
Caution
The heat sink has thermal paste located on the bottom of it. Use
caution when you remove the old heat sink so you do not damage the
thermal paste. If you damage the thermal paste, you must apply a new
bead of paste to the heat sink when re-installing it.