MacPro + 8800GT + Snow Leopard = fan noise!!

I have a MacPro Dual-Core Xeon 2.66GHz (form year 2006) and I have a Nvidia 8800GT.
When I startup from 10.5.x (Leopard) I don't have noise from the fan of the video card,
but if I startup form 10.6.x (Snow Leopard) I have a loud noise from the fan of the video card!!
what I can do!?
sorry for the bad english..
lenny

Odd, I don't hear any difference and I wonder if you installed 10.6 over 10.5.8, or clean install?
It always tends to make a slight audible noise from the fan on cold boot, that seems normal and just its way of operating. But not what I would call 'loud' and it is very short.

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