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Mac Pro 2008 Upgraded CPU Overtemp

MTYEAGLESCOUT

MTYEAGLESCOUT

macrumors member
Original poster
Mar 29, 2018
33
13
I was wondering do I need to upgrade the Heatsinks since I am getting the Overtemp Light on when giving the board power. I upgraded the Dual 2.8 Xeons to Dual Xeons X5482 since it went from 80W to 150W for the CPU. And if so what would be the Best after market Cooler or what is the part number for the Heatsinks compatible with 3.2 GHz Xeon.

Thanks in advance.
 
The cpu cooler can't be fitted properly if your getting over temp on boot. re check heatsink installation, look at the bottom of heat sink at the thermal paste, and make sure CPU is touching the heat sink. don't forget new thermal paste if it wasn't as fans would have blown all kinds of dust particles into the thermal paste you applied the first time.
 
Matty_TypeR said:
The cpu cooler can't be fitted properly if your getting over temp on boot. re check heatsink installation, look at the bottom of heat sink at the thermal paste, and make sure CPU is touching the heat sink. don't forget new thermal paste if it wasn't as fans would have blown all kinds of dust particles into the thermal paste you applied the first time.
Click to expand...
It flashes the lights and then doesn't turn on. And LED on power button is constantly on when connect to power.
 
MTYEAGLESCOUT said:
It flashes the lights and then doesn't turn on. And LED on power button is constantly on when connect to power.
Click to expand...
Is there a way to know if I accidentally grabbed my Heatsinks from a 2006 cMP and that is why it is not powering up.
 
yes it will do because the CPU gets instant hot and Mac shuts down to protect it, make sure CPU is seated properly in socket and that heatsink touches the CPU, it should leave a flat imprint in the thermal paste used on bottom of heat sink. you can damage the CPU if you keep trying to boot when its telling you its to hot.
[doublepost=1535384384][/doublepost]I think you need to tell the whole story, you either used heatsinks from a 2006 or you didn't. is your CPU upgrade a "SLA" stepping cpu?
 
2008 has 3 folded copper pipes. 2006/2007 has just one folded copper pipe.

eBay picture of 2006/2007 heatsink:

s-l1600.jpg
 
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