read the tweak on some forum n its realy helpful for keeping the card cool.
hd4850(sapphire..amd referrence card) used to idle at 70-75c
now its idling at 32c @50%fan speed, 35c @42%
at load, its 53c @50% n 59c @42%
had to use fan @65% to bring it to 33c idling n 56c load when room temp used to be ~32c
room temp ~28c.
cant notice fan noise at 42% (~3750rpm)
at 50%(~4775rpm)..its barely noticable over el cheapo case fan n amd stock cooler.
65%(~6375rpm) realy sounds like a hair drier