Dell Alienware x16 R2 Owner's Manual page 98

Steps
1.
CAUTION: Do not use an alcohol wipe to clean the Element 31 thermal grease off the surface of the CPU or GPU, the
alcohol solution from the wipes dissolve the Element 31 grease into conductive metal particles. If these conductive metal
particles come into contact with the surface of the system board, it causes an electrical short when your computer is
turned on.
Align and place the fan and heat-sink assembly on the system board.
2. Align the screw holes on the fan and heat-sink assembly to the screw holes on the system board.
3. In the sequential order (1>2>3>4>5>6), replace the six screws (M2x3) that secure the fan and heat-sink assembly to the system
board.
4. Turn the system-board assembly over.
5. Connect the left fan and right fan cables to the system board.
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