I am interested in this as well. I have Afterburner controlling the fan now, but I'd much rather just have it setup in the cards bios. From my research though, I think the fan is controlled by the ATI drivers on these new cards, not the bios. I used RBE and modified the fan settings in my 6950 bios, which worked while the system was booting, but as soon as windows loaded the video driver, the fan went back to original stock fan speeds. Let me know if you find any way of doing this!
Same problem, also tried RBE but didn't make any sence. Currently using MSI Afterburner for a decent fan chart