Raist, in this generation memory can be ignored. DDR4 can be ignored for atleast one or two more years. Till DX12 actually kicks in, it won't give you a actual performance increase over ddr3. So if you have ddr3 ram, it's ram. It does what it's supposed to do, doesn't matter which one you get, they're pretty much the same. (except if you're going to force ddr4 on ddr3 ofcourse )