HP Enterprise ProLiant DL380 Gen10 Maintenance And Service Manual page 201

20. Install the processor-heatsink assembly:
a. Locate the Pin 1 indicator on the processor carrier and the socket.
b. Align the processor-heatsink assembly with the heatsink alignment pins and gently lower it down until it sits evenly on the
socket.
The heatsink alignment pins are keyed. The processor-heatsink assembly will only install one way.
Your heatsink might look different than the one shown.
c. Using a T-30 Torx screwdriver, fully tighten each heatsink nut until it no longer turns.
CAUTION: Be sure to tighten each heatsink nut fully in the order indicated. Otherwise, boot failure or intermittent CAUTION:
shutdowns might occur.
Removing and replacing the system board 201