User Guide

Mac Pro (8x) Troubleshooting — General Information 146
Processor Heatsink and Processor Visual Inspection Instructions
The Mac Pro (8x) uses a special coating on the processor heatsink and processor to manage the
temperature in the computer. Before installing a new or existing heatsink or processor, always
make a visual inspection of the part. Specically, check the application of the silver-colored
coating on the underside of the heatsink and the top of the processor. In addition, check the
condition of the gasket that surrounds the coating on the heatsink.
Important: When inspecting the special coating, wear disposable nitrile or latex gloves and avoid
touching the coating.
Silver-Colored Coating on Heatsink and Processor
Use the following guidelines to determine if the silver-colored coating on the underside of the
heatsink and the top of the processor is correctly applied. If a new, replacement heatsink or
processor fails to meet the prescribed standards, return it to Apple. If an existing heatsink or
processor fails the standards, replace it with a new part before installing it in the computer.
Acceptable standard
The silver-colored coating should be applied in a smooth, even square as show below.