Dell Precision 7820 Owner's Manual page 54

3 Flip both the processor and the carrier over so that the pins on the processor and the logo side of the carrier are facing up.
4 Carefully insert the processor into the carrier so that it is secured by the hooks on the upper and lower side of the carrier.
NOTE: After inserting the processor into the carrier, check to see whether the small triangle on the processor aligns
with the triangle on the carrier. If they are not aligned repeat the preceding steps.
5 Align the processor and carrier assembly with the heat sink so that the triangle marks on the processor and carrier are aligned with the
triangle mark on the top side of the heat sink (captive screw #2).
54 Removing and installing components