Updating to nvclock version 0.8beta3a did help in that it now recognizes my card, but it still can't adjust my fan speed
aria ~ # nvclock -f -F 40
Uknown Winbond vendor: ff
Error: Your card doesn't support fanspeed adjustments!
I did find a pretty equivalent solution though: I lined the cabinet my box sits in with carpet! Acoustically, it did a lot to quiet the fan. Air can still flow in and out of the computer case just fine.