Hello, i just bought a sapphire 7770. I already had 2x4gb 1600 ram but i have a fm2 mobo (fm2a55m-gds) and A4-5300 apu. i want to chage CPU , but idk what should i take. It's enought to take just an athlon x4 750k , or it's better to go for i3-3220 with a new mobo? or maybe getting a fx 6300 and a new mobo with 2x pci 16x and a second 7770 is the best idea? will i3 handle mmo games?