A friend bought a new desktop Windows computer. He bought it with only 4GB RAM, and, as you would expect, it runs excruciatingly slowly.
I have the following lying around. I understand that they ought to be of the same generation x for DDRx (e.g all DDR3), and should have matching speeds, but I really want to be sure that I don't make any mistakes here.
Given that he has 2 slots for rAM, which of all of these will give him the maximum compatible RAM size?