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In my system I have an NVIDIA video card (GeForce 450 GTS) as an extra card (video output via motherboard ATI) for bitcoin mining.

If I start mining, the fan speeds up a little, but the weird thing is, if I stop mining the fan starts to spin much much faster (generating lots of noise). And it doesn't stop doing that.

What could be the cause? And how can I fix that?

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How precisely do you stop mining? – David Schwartz Aug 26 '11 at 11:48

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