I got a gigabyte 4850 card and run some 3dmarks to compare with 8800GT. I have also mounted Accelero S1 cooler and I was amazed by the temperature drop I saw. Basically stock cooler is a total crap and you can't really control fan because it runs only @ 10%. Anyway at full RPM it would be very loud.
Test system:
ATI HD4850 @ 700/1000, driver 8.6 with hotfix
NVidia 8800GT @ 700/1000, 175.16
DFI LP T3R, E8500 @ 4.4Ghz
2x1GB DDR3 7-6-6-18 @ 815Mhz
Zippy 700W PSU, cut down XP SP2
Results, I cant overclock 4850 more than 700 at the moment because there is no tool that supports it except CCC
3dmarks
Temperature
HD4850 has a standard hole spacing, same as 8800gt and other so Accelero S1 fits just fine
I have also attached screenshots of 4850 3dmark runs
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