I just flashed with my q6600 to the 2C 521 bios and could unlock the multiplier.... but had some stability and oc problems...... with the 4C 521 i have the multiplier of the Q6600 locked at 9x but at least i have a stable OC at 3.2 ghz 1.3 v as daily used and dual prime stable.

I just cannot go up with the fsb and dunno why, also tried to change to the 2C bios to set the multiplier to 8x to check if it was a cpu frequency limit, but also with 8x multiplier i couldn't boot up the system with the fsb above 360 mhz...

Do you have any tips for a stable 400x8 daily use Q6600 air cooled system?