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One way to fix an overheating graphics chip in an iMac
Authored by: audiophil on Jan 20, '10 10:44:35PM

Well then.
I've had similar issues with an imac that was abandoned by a customer and left to the junk heap. (Not the model pictured in this comment, the older generation G5 models with the CIP design, were everything attaches to the back of the display) The proc or bridge controller was overheating. My solution was to remove the grill on the inside of the back panel;(that sits flush with the air channel for the CPU heatsink) to increase the airflow through the existing air channel integrated in the back case. after removing the small gril (with no other exterior cosmetic changes) the temp stayed lower, and the overheating -> instability/slowness issues went away.

I've done this to 3 other machines to remedy similar problems with CPU temp where new fans/cleaning weren't solving the problem.

Just a FYI for you folks out there, before you go cutting your case apart.



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