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Some new video cards have built-in temperature settings, such as my roommate's Tyan 9600pro and some Asus offerings. For all the rest, you need a temperature probe. A good place to put the probe is either on the side of the graphics chip (if there's room) or right behind the chip on the back of the card.
You will probably need some airflow. I have a 350g, all-copper heatsink epoxied to my GF3 Ti200, and I think it needs a fan. If I don't use a fan, then the heatsink becomes too hot to touch for more than half a second... and that's just when Windows idles for 10 minutes. However, adding a slow 80mm fan that generates 10-15cfm puts the heatink into the "warm" category, and I can hang onto it even after a stretch of 3D gaming.
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