Does NVidia GeForce 8800GT have a heat problem?

I have an older heavy-duty Mac Pro running with 8-core Intel 3.2Ghz Xeon processors and 18GBytes RAM, using an NVidia GeForce 8800GT display controller driving a 30' Apple Cinema display. After the Mac Pro has been on for half a day the white semitranslucent bars start to appear and gradually the screen goes to nearly all white if I leave it on long enough. In about an hour after I turn it off, the display is fine.
What component is the likely cause of this behavior? I do not hear any fan noise. Should I?
I have seen other reports of heat problems with temperatures and fan speeds mentioned. How do I find this out for the Mac Pro? MacOS verion is 10.6.3.

Less than 80ºC (load) is desired, but up to 85ºC may be seen. A good cooler would keep the processor down in the mid 60's to mid 70's under load.
Prolonged temps at and above the mid 90's will reduce component life.
Certainly temps over 100ºC would be terminal in the long run.
One would hope to see the card run between 50ºC at idle and no higher than the mid 80's under load.
Lower load temps (mid 70's) are better.......
The 8800 GT is getting old. Any card approaching or exceeding 5 years of use should have the thermal compound replaced.
All fan equipped graphics cards need to be kept clean and dust free. A dust clogged heat exchanger is almost as bad as no cooler at all.

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