What are signs of an overheated video card?

Soybean

Member
Sep 2, 2000
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I just removed the ATI fan off of my Radeon 9100 because it was too loud, and instead have a 92mm fan blowing on it using a Zalman fan bracket.

However, the heatsink still gets quite warm when playing games. I was wondering what are the signs of an overheated video card??? Is it only artifacts and crashes, or will an overheated card lose FPS and have choppy graphics also?