I'm gonna build my new pc. And i'm wondering if phenom II 925 could go with the hd 5770, gtx 460 or hd 5850 . And will 6GB DDR2 800 be better than 4GB DDR3 1333 ?. One more question i need the answer is that: Do i have to pair the nvidia card with intel processor or ati card with amd processor ? P/s : I'm totally new to computer hardware.