With some older games i have when i open them it defaults to core affinity 0 and 1 and for some reason this only uses 0 and non of 1 (making it single threaded). If i set it to 0 and 2 or all four (0,1,2,3) then it uses 2 cores properly. Why is this and how can i make it so i don't have to do this every time i open the games with this issue? Also another problem, in some older games my 7900GT has better performance than the 7660D. It's fine in newer games like bf3 etc but older games it just doesn't have any grunt, why is this? :\ edit: I am talking about older games that can make use of two cores, not single threaded ones.