Its just marketing, since AMD owns ATI now they would prefer you have both their CPUs combined with their graphics as well. Ive always had AMD cpus minus the Pent 2 400mhz I had 10 years ago. Recently had a X2 6000 cpu bundled with a Nvidia 8800 GTs 640mb card and games ran fine. Curently I went with a Phen 2 955 and a ATI 4870 1gb and everything runs great as well!