GPU temperature is above 70 C, and CPU fan is above 2400 rpm

I've had my iMac for two years now. I play a lot of games and watch a lot of HD videos. In the past week, the computer has gotten a lot hotter than usual and it stutters a lot, and I feel like the two are related.
Today while playing a game I noticed that the GPU Diode reached 70 C (using iStat Pro), which I have never seen before. Therefore, the CPU fan was at 2400 rpm.
I play a lot of games, including this same one, and I have never seen the GPU this hot before, and almost never hear the fans running so loudly and so rapidly. (I can't even recall a time when I could very clearly hear the fans running.)
Could all this be a sign to a more bigger problem?

It's all settled down by now but here were some stats I posted earlier:
HD: 53
CPU: 52
Ambient: 30
GPU Diode: 71
GPU Heatsink: 66
Mem Controller: 60
Optical Drive: 52
Power supply 2: 75
Fan speeds:
Optical drive: 1110 rpm
Hard drive: 1100 rpm
CPU fan: 1421 rpm
Which part of the iMac do I blow out the dust? Do I use compressed air (which I have) or a vacuum cleaner? Do I do it through the vent at the back/top of the iMac, or open the memory bay and do it through there (and if so, do I have to take out the memory sticks first?).

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Quote
Originally posted by hesido
Hi,
Lately I started to keep my computer on overnight for p2p downloads. Problem is, my setup is too loud, thanks to the NB fan esp. I have my computer in the same room as my bed so the smallest DB difference makes an impact on my overall sleep quality
P2P is not a cpu challenge, so right now I am trying this:
Have speedfan turn off both NB and CPU fan when CPU is below 45C.
CPU temp controls both NB and CPU fan as NB readings come from a Hawai beach.
My room is really hot, my system temp is around 40C.
It is also possible to underclock my p4 2.4 down to 1.6ghz with Clockgen.
When Speedfan turns off NBfan, the lights go off to so I am not disturbed in my sleep by the lights
Now:
Is speedfan's cpu readings dependable?? (It certainly reads different than CoreCenter)
Is stopping the NB fan bad?? Many people even remove it, but stopping it maybe worse than throwing it away in terms of airflow?
Anyhow would my NB warmup at all if you think it handles 200mhz fsb and my FSB will be only 133, so isn't my NB underclocked already, so it wouldn't warm up as much?
Should I underclock my P4 to 1.6ghz so it would keep it and the NB cool even more?
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Quote from: xgm on 02-July-06, 15:45:36
What's the maximum permissible working temperature (in ºC) for the mainboard and the AMD64X2 4400 CPU.
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CPU: AMD64X2 4400 CPU
Thank you!
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GPU temperature is above 70 C, and CPU fan is above 2400 rpm

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