iTunes or Audio increases cpu temperature
Hi,
I have a 3 week old Mac Pro Quad 2.66 2009 that has an idle CPU temperature of about 35-37C with Safari, Quicktime, iTunes, Mail, iCal, Preview all open but not processing anything.
If I start to play anything that includes audio I notice that the CPU temperature (as reported in iStat Pro) will increase to 60C within 1 minute. To clarify, when I say audio this can include playing a song in iTunes, a movie in Quicktime, browsing a website that includes flash or embedded quicktime, or even just having garageband open. All of these actions cause no more than 1% CPU usage, except for maybe the web site's flash content.
I can't explain why such minor actions would cause such a massive spike in the CPU temperature, other things that consume 70-80% I could understand, but just iTunes alone, it doesn't make sense.
I would be less concerned about this if the fan controller decided to do something about it, but it just seems to ignore it, the exhaust and intake fans remain at a constant 599 rpm through out.
Could this be an issue with the onboard sound controller? The new nehalem architecture?
I've noticed that there are a few other threads in Apple's discussion forums and on Macrumors about this topic but they seem to have become inactive of recent. Can anyone else confirm they notice this same issue or simply test it using iTunes?
Thanks in advance for everyones help,
Mike.
I have a 3 week old Mac Pro Quad 2.66 2009 that has an idle CPU temperature of about 35-37C with Safari, Quicktime, iTunes, Mail, iCal, Preview all open but not processing anything.
If I start to play anything that includes audio I notice that the CPU temperature (as reported in iStat Pro) will increase to 60C within 1 minute. To clarify, when I say audio this can include playing a song in iTunes, a movie in Quicktime, browsing a website that includes flash or embedded quicktime, or even just having garageband open. All of these actions cause no more than 1% CPU usage, except for maybe the web site's flash content.
I can't explain why such minor actions would cause such a massive spike in the CPU temperature, other things that consume 70-80% I could understand, but just iTunes alone, it doesn't make sense.
I would be less concerned about this if the fan controller decided to do something about it, but it just seems to ignore it, the exhaust and intake fans remain at a constant 599 rpm through out.
Could this be an issue with the onboard sound controller? The new nehalem architecture?
I've noticed that there are a few other threads in Apple's discussion forums and on Macrumors about this topic but they seem to have become inactive of recent. Can anyone else confirm they notice this same issue or simply test it using iTunes?
Thanks in advance for everyones help,
Mike.
Mac Pro 2.66 Quad, Mac OS X (10.5.8)
