Asus F1A75-V PRO - Manual (Page 26)

2-6 Chapter 2: Hardware information
Chapter 2
3. Position the APU above the socket such
that the APU corner with the gold triangle
matches the socket corner with a small
triangle.
4. Carefully insert the APU into the socket
until it fits in place.
5. When the APU is in place, push down
the socket lever to secure the APU. The
lever clicks on the side tab to indicate
that it is locked.
Gold triangle
Small triangle
6. Apply some Thermal Interface Material
to the exposed area of the APU that the
heatsink will be in contact with, ensuring
that it is spread in an even thin layer.
Some heatsinks come with pre-applied
thermal paste. If so, skip this step.
The Thermal Interface Material is
toxic and inedible. DO NOT eat it. If
it gets into your eyes or touches your
skin, wash it off immediately, and seek
professional medical help.
To prevent contaminating the paste, DO NOT spread the paste with your finger.