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One core of four (CPU A Core 2 Diode) Runs Really Hot
I have a Power Mac G5.
Hardware Overview:
Model Name: Power Mac G5 Quad
Model Identifier: PowerMac11,2
Processor Name: PowerPC G5 (1.1)
Processor Speed: 2.5 GHz
Number Of CPUs: 4
L2 Cache (per CPU): 1 MB
Memory: 12 GB
Bus Speed: 1.25 GHz
Boot ROM Version: 5.2.7f1
Lately the fans run loud so I installed Hardware Monitor and it appears that CPU A Core 2 is running into 90°C while all the other cores are staying below 60°C.
Can this be right? Wouldn't CPU A Core 2 be under the same die as CPU A Core 1?
Can anyone say why this might be happening and how I can fix it? I build computers and I'm not afraid of pulling the LCU out and re-applying thermal interface, but it sounds like the design of the computer might make that difficult.
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Score
mayer
148.9k
Answered
You may have developed a coolant leak. You'll need to do some reading on this, but here's a start:http://www.xlr8yourmac.com/systems/G5_co...
I have inspected the inside of the case and see no signs of a coolant leak. However, I just noticed that the one core that is overheating, also has a higher voltage and current than the other three by 16-20%, the overheating core has a voltage of 1.29 - 1.35 while the others are 1.18 - 1.21, also, the Current is 23A while the others are 20A. I'm supposing this isn't a coolant problem, however, it doesn't look good for my old workhorse! I suppose, before I do anything more I should reinstall Mac OS, just to be sure.
Make sure you have the original system installation disk with the fan sycning software because any major changes will require it or your fans will run wild.
I don't have the original disks, which were 10.4, I'd be installing directly with 10.5. Where can I find the fan syncing software? I have the full OS X 10.5 Install disks for all Apple hardware.
