http://forums.ubi.com/eve/forums/a/tpc/f/23110283/m/7311098946?r=9901000156#9901000156
in here it mentions that ProcessAffinityMask=15 allows Il2 to use all available cores.
My processor is clocked at 2.7ghz with no heat penalty and is stable, any more and instability rears its ugle head.