i installed this BIOS a few days ago and it works perfectly:

http://www.mvktech.net/components/co...fan_unlock.bin

it runs the fan at 33% idle and 59% full load. my idle/load temps are 45/63 (63 is the high end in Crysis. it loads in the high 50's in CoD4). here is a screenshot of the Riva monitor after playing CoD4 for a while and exiting the game.



it also fixes the 862 MHz wall. enjoy!