Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 2.8 and 3.0 GHz Processors 73
Using a long-handled, magnetized 3 mm athead hex screwdriver, loosen the four captive 2.
mounting screws for the upper processor heatsink in the order indicated below.
Lift the heatsink straight up and out of the enclosure.3.
Disconnect the cable connector for the lower processor (CPU B) heatsink. 4.