alright
with my old mobo, the newest and best cpu i could have is the x2 4200+
and that is what i have
the two cores both run at 2.2 ghz and i have it overclocked to 2.4 ghz.
when i had a 7900 gs xxx my rig ran toribash at 60 fps and never dipped even in environment mods. without my graphics card, the onboard radeon graphics card coupled with the 4200+ churned out 30-40fps. if you have a decent graphics card, 6600 gt and above, youre frames with your q6600 will never dip. I hear of people stably running the q6600 go at 3.4 ghz although i dont recommend oc'ing. so you should be fine, better than fine with that cpu.