Supermicro H12SSL Series User Manual page 29

11. After the Force Frame is secured and the CPU package is in place, now you must
install the heatsink to the frame. Lower the heatsink down till it rests securely over the
four screw holes on CPU Package on the socket frame.
12. Using a diagonal pattern, tighten the four screws down on the heatsink in a clockwise
fashion till it is secure. The heatsink will now be secured and you have finished installing
the processor and heatsink onto the motherboard. Repeat this procedure for any
remaining CPU sockets on the Motherboard.
#3 Screw
#1 Screw
#2 Screw
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Chapter 2: Installation
#4 Screw