just curious if my system is bottlenecking.i have just bought an xfx 6870 hd 2gb but only a phenom x2 black edition cpu in rift my framerates hardly went up with the new gpu maybe around 20fps-30fps although it dont spike or lag anymore it still gets choppy at times when theyres alot goin on.did i expect to much out of the card?, or do i need an 8 core and a 9 series board?