I know alot about computers already. But what i'm not 100% sure on is if on the z87 chipset 4x4gb is slower than 2x8gb. from my understanding it will be an unnoticeable difference and shouldn't matter. the only reason i am getting 4x4gb is because i am shallow and think it looks nicer with all slots filled. I have an asus sabertooth z87 and an intel i7 4770k.