Asus PS4 - Manual (Page 24)

Chapter 2: Hardware setup 2-6
2. Twist each of the two screws with
a Philips (cross) screwdriver just
enough to attach the heatsink to
the motherboard. When the two
screws are attached, tighten them
one by one to completely secure
the heatsink.
2.2.2 Installing the CPU heatsink and airduct
To install the CPU heatsink:
1. Place the heatsink on top of the
installed CPU, ensuring that the two
fasteners match the holes on the
motherboard.
2. Carefully lower the airduct until it
fits in place.
To install the airduct:
1. Position the airduct on top of the
heatsink.