Asus AP1600R - Manual (Page 24)

24 Chapter 2: Hardware Setup
Install the Heatsink
1. Carefully place the heatsink on
top of the installed CPU. The
heatsink fits in only one
orientation. Take note of the
heatsink placement as shown.
2. Use a Phillips screwdriver to
twist each of the four screws to
secure the heatsink to the
motherboard.
You must remove the riser card module and card bracket assembly
before installing or removing the heatsink.
NOTE