So I have a Asus Sabertooth x58 as my motherboard and my graphics card is MSI nvidia Geforce GTX 260 1BG. I was thinking of upgrading my graphics card to a GTX 760 for a better gaming experience but then I noticed that my motherboard only has a pcie 2.0 slots and the graphics card requires a pcie 3.0 slot. So if I get the the new graphics card will there be any major performance drops? I really wouldn't want to buy a new motherboard either.