User Guide

Mac Pro (8x) Take Apart — Processor Heatsinks 73
Visual Inspection of Heatsink Gasket
Before installing a new or existing heatsink, check that the gasket that surrounds the silver-
colored coating on the underside of the heatsink is in good condition, as illustrated below.
Replace the gasket if it shows obvious damage, such as cracks, folds, and broken-o surfaces, or
if it is dislocated from the heatsink. The gasket is available through GSX as part of the Mac Pro
Grease Kit, part number 076-1258.
Replacement Instructions for Krytox Grease
The Mac Pro (8x) uses Krytox grease to ensure a proper seal between the heatsink and processor.
A bead of the grease rims the gasket on the underside of the heatsink and comes pre-applied on
replacement heatsinks.
Re-installing Existing Heatsinks/Processors
If you are re-installing existing heatsinks and processors, or transferring existing heatsinks and
processors to a replacement logic board, in most cases you do not need to reapply Krytox grease.
However, if additional grease must be added, do the following:
Order the Mac Pro (8x) Grease Kit (part number 076-1258).•
Reassemble the unit while you wait for the kit to arrive.•
Once you have the kit, remove the heatsink and/or processor from the enclosure.•
Using rst the lint-free cloth and then the alcohol wipe from the grease kit, carefully clean •
o any residual grease from the underside of the heatsink and the top of the processor. (See
“Installing New Heatsinks” below for more information.) Finish wiping the surfaces one
more time with the cloth.