I havent used the same processor as yours but I did have a AMD 2.83ghz processor and I managed to overclock it to about 3ghz comfortably. I think the problem would be solved if you put all your video settings down though apart from the ones you need most (on the main). I used to 5 box on my Amd system before getting a quad. Even with the quad core though I still have all my clones set to a max of 15fps and I have every video setting on minimum.