hmm I'm not sure if I must go with the 6770 or the 7750, but the link that TherealYeno gave me is a good find and it's also cheap. But the problem is that it's a pcie 3.0 and my motherboard has pcie 2.0. Will a 3.0 fit in a 2.0? And I also have some other question. What means the DDR3 or the DDR5 on a gpu?