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Originally Posted by Pie
Also, check out your northbridge fan. I had similar intermittant failure on my fileserver -- turns out the nb fan was choking, and data was getting corrupted on the way to the drive... I lost two years' worth of email.
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If Northbridge needs a fan, then the Northbridge was defect. A computer must work just fine in a 100 degree room or have parts heated by a hairdryer on high. Heat is a diagnostic tool. Unfortunately, too many fix a defect by curing symptoms. They don't learn the whys. They simply install more fans.
That is the Home Improvement joke. Fix things with "more power". If a fan is required on that Northbridge, then the Northbridge IC is defective. One chassis fan is more than sufficient cooling for most every computer. That one chassis fan will provide sufficient airflow over any Northbridge.
But again, that Northbridge must work just fine when so warm as to be uncomfortable to touch. Learned this of the old timers who used to say in the 1960 - if it does not leave skin, then it is not too hot. Today, our IC must run normal at even higher temperatures.
A Northbridge fan suggests Northbridge IC is defective. Someone cured the symptom rather than fix the problem. Heat is a diagnostic tool.