You've got a pretty decent CPU already.. what kind of Motherboard are we working with? There enlies what limitations we have to work with.
Really, you need to provide more information to get a reasonable answer. What are you wanting to do with the computer that you cant do now, and what kind of budget, etc.
the motherboard supports crossfire and has 6 ram slots. i really dont no much more past that.
right now games run good. slight fps drop in some games like shogun total war on high but for the most part good. i would like to be able to record games and make videos and stuff. right now trying to do that works pretty well but not as well as i like it. 300 dollar budget