DFI AZ30-TC User Manual page 21

Do not apply the paste if the fan / heat sink already has a patch
of thermal paste on its underside. Peel the strip that covers the
paste then place the fan / heat sink on top of the CPU.
2. After placing the fan / heat sink on top of the CPU, latch the
retaining clip on one side of the fan heat sink onto the protrud-
ing tab on the side of the socket.
3. Push down the other retaining clip until it latches and lock onto
the protruding tab on that side of the socket. Make sure there is
sufficient air circulation across the CPU fan and heat sink.
Hardware Installation
Strip
Retaining clip
Tab
2
21