ATI tool 0.21 and fan speed.

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I installed this a few hours ago and there is an option for controlling the fan speed on the graphics card. I have enabled this and even cranked it a little and there seems to be a slight decrease in temps (80max to 76 max).
I was wondering, does anyone think this will shorten the life of the fan/card? I dont wanna kill the fan while I'm doing this :-)

[HousERaT]

Most fans are already running as fast as they were designed to.... overclocking it isn't such a good idea, especially on a videocard where you can't always see it. You will most certainly short the fan's lifespan by overclocking it.

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unfortunately, thats what I thought. Anyone know for sure? ie the exact make and rating on the fan?