CPU Installation and Removal
BACKGROUND
The POWER9 CPU uses a unique retention mechanism designed to center-load the CPU in the
socket and ensure good contact in the area of the central lands. This mechanism is spring loaded; a
single 5/32” hex screw engages and disengages the retention system.
The heatsink assemblies you have received may have had the screw tighten or loosen in transit. After
placing the heatsink on the CPU per the following instructions, visually inspect the two latching prongs
protruding from the load frame assembly. If these prongs are not vertical, loosen the retention screw
of the heatsink assembly and gently reposition the heatsink, watching for the latching prongs to move
into a vertical position.
NOTE:
Incorrectly positioned locking pins will cause the heatsink to start to tilt as the retention screw
is tightened. If this happens,
immediately stop tightening the screw
, carefully loosen the retention
screw, and double-check the prong and pin alignment before attempting to reattach the heatsink. In
some cases, removing and re-placing the heatsink is the easiest method to allow it to seat correctly.
© 2017 - 2019 Raptor Computing Systems, LLC
C1P9S01 User's Guide Version 1.00
All Rights Reserved
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Illustration 2: Correct Retention Mechanism Prong Alignment (Unlocked)