Well it depends how much money you are going to spend. The type or RAM depend son the motherboard, so picking DDR3 and DDR4 is dependent on the motherboard (physically). If money is an issue, I would recommend 4GBx2, to get that dual channel performance. However, if you can, I would really recommend 16GB (8GBx2). Yesterday, I was playing Watch Dogs 2 on max settings on 1080p, and 9GB of RAM was used. Just something for reference.