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There is a fan speed hack floating around the web where you create a profile in CCC and manaully input the fan speed in the profile's XML doc. A fan speed of 41% bought my temp down from 79c to around 61c and with no extra fan noise.
Edit: Here ya go.

My 3870 runs at 40 - 45c when idel and 70 - 80c at load. Also I bet your case is quite toasty with the card running 70 -80c at idelI wont be getting a sapphire 4850 then by the looks, if what you say is true cos....
1. Cant be doing with a loud card, so much so, Ive updated the bios on my 3870 cos at idel the fan was at 41% and quite loud, so Ive knocked that down to 20%.
2. 70 - 80c when idelMy 3870 runs at 40 - 45c when idel and 70 - 80c at load. Also I bet your case is quite toasty with the card running 70 -80c at idel
I wont be getting a sapphire 4850 then by the looks, if what you say is true cos....
1. Cant be doing with a loud card, so much so, Ive updated the bios on my 3870 cos at idel the fan was at 41% and quite loud, so Ive knocked that down to 20%.
2. 70 - 80c when idelMy 3870 runs at 40 - 45c when idel and 70 - 80c at load. Also I bet your case is quite toasty with the card running 70 -80c at idel

If 70-80 idle wont last long then 70-80 load wont last long.