Unless you have something to back that up, otherwise you are just spreading false rumors.
I own and run all my nVidia GPUs at 99-100% usage (as measured by GPU-Z). It runs folding @ home projects.
I have used 8800GS, 8800GT, 9800GT, 9800GTX, 9800GX2, 9600GSO, GTX295, GT240, GTX 260, GTX 460.
All high end cards have reached 90C and above, and no problems at all. And all running 24/7 for over a year.
Just go to folding@home forums and you will see tons of people running at such high temperatures.
How hot do you think tesla clusters reach when they are packed together in a server rack? I would tell you well over 90C if not 100C+.