Ok I have tried your settings Saxile & yes I can boot up into windows at 4.1 with my QX6850 and temps are still quite respectable.
I cannot however get more than 32 mins Prime95 stable and getting BOSD with Intel burn test on the 1st run. Whats the Max volts you have tried? I dont feel good putting more than 1.6 through this chip.
I have gone back to my OC gear setting of 3.75 right now because i have some work to do & my settings are-
CPU- 1.43
VTT-1.200
PPL-1.508
NB-1.300
SB-1.500
DRAM-1.80
With these settings everything is between 30c-32c
I cant understand why it needs so much more volts just for that little bit more ghz