Anybody else here tried the fan speed xml tweak for the 48xx series? Ive just had a go and the temps gone down by about 20 degrees, without an increase in the volume.
Trouble is, 100% seems to make the card sound like a jet engine...

Not purchased yet but im temped.

Get one of these and slap it on as i have heard noting but good things about these dropping the temps and being very quiet.

Akasa AK-VC03-BLUV Vortexx NEO VGA Cooler

If you google it you can get one for about £20.

The stock cooler seems to work a charm if you crank the fan speed up to about 40%. Havent got load temps yet tho.