Apple mac pro early 2008 User Manual

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 2.8 and 3.0 GHz Processors 71
Processor Heatsinks for  
2.8 and 3.0 GHz Processors
This procedure applies to 2.8 GHz and 3.0 GHz configurations of the Mac Pro (Early 2008). For the 
3.2 GHz configuration, see the procedure “Processor Heatsinks for 3.2 GHz Processors.”
Note: The heatsink for 2.8 GHz and 3.0 GHz processors requires thermal grease for proper 
operation. Every time you remove the processor heatsink, you must replace the thermal...

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 2.8 and 3.0 GHz Processors 72
Part Location
Procedure
Disconnect the 2-pin cable for the upper processor (CPU A) heatsink from the logic board. 1.  

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 2.8 and 3.0 GHz Processors 73
Using a long-handled, magnetized 3 mm flathead 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.  

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 2.8 and 3.0 GHz Processors 74
Using a long-handled, magnetized 3 mm flathead hex screwdriver, loosen the four captive 5. 
mounting screws for the lower processor heatsink in the order indicated below. 
Carefully tilt the heatsink so that it clears the bottom lip of the enclosure and then lift the 6. 
heatsink out of the computer. 

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 2.8 and 3.0 GHz Processors 75
Replacement Procedure
Preparing an Existing Heatsink for Re-installation
If you are reinstalling an existing processor heatsink, complete steps 1–4 below for applying new 
thermal grease to the underside of the heatsink. If you are installing a new heatsink, do not apply 
thermal grease and skip to the next section, “Preparing a New Heatsink for Installation.”
Using the alcohol pad included with the logic board or...

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 2.8 and 3.0 GHz Processors 76
Preparing a New Heatsink for Installation
If you are replacing a processor heatsink with a new heatsink, complete steps 1 and 2 below. 
Apply the top gasket included in the parts box to the top of the heatsink.1. 
If you are replacing the 2.  lower processor heatsink with a new heatsink, install the bumper 
included in the parts box on the side of the heatsink.
Note: Do not apply thermal grease to a new heatsink. It...

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 2.8 and 3.0 GHz Processors 77
Installing the Heatsink
Carefully align the posts on the lower heatsink with the mounting holes in the logic board, 1. 
and lower the heatsink onto the processor.
Lightly tighten the heatsink mounting screws in the order indicated below.2.  
To secure the heatsink to the processor, again tighten the screws in the order indicated.3. 
Reconnect the processor heatsink cable to the logic board.4. 
Repeat steps 1–5 for the...

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 3.2 GHz Processors 78
Processor Heatsinks for  
3.2 GHz Processors
The Mac Pro (Early 2008 Dual 3.2 GHz) computer uses a special coating on the processor heatsink 
and processor to manage the temperature in the computer. The silver-colored coating comes 
applied to the underside of the heatsink and the top of the processor.
Use the following guidelines when handling the processor heatsink and/or processor:
Wear disposable nitrile or latex gloves.•...

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 3.2 GHz Processors 79
Part Location
Procedure
Disconnect the 2-pin cable for the upper processor (CPU A) heatsink from the logic board. 1.  

Mac Pro (Early 2008) Take Apart — Processor Heatsinks for 3.2 GHz Processors 80
Using a long-handled, magnetized 3 mm flathead 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.