Supermicro X11SSL-nF User Manual page 29

7. Align the four heatsink fasteners with
the mounting holes on the motherboard.
Gently push the pairs of diagonal
fasteners (#1 & #2, and #3 & #4) into
the mounting holes until you hear a click.
Also, make sure to orient each fastener
so that the narrow end of the groove is
pointing outward.
8. Repeat step 7 to insert all four heatsink
fasteners into the mounting holes.
9. Once all four fasteners are securely
inserted into the mounting holes, and
the heatsink is properly installed on the
motherboard, connect the heatsink fan
wires to the CPU fan connector.
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Chapter 2: Installation