2x8 is better than 4x4 because they generally run faster(there are test on youtube) unless the 4x4 has a higher speed and less CAS then it is a different story, and you are able to upgrade to 32GB soon if you need though i do agree with BloodyWaters 16 is overkill ATM and 32 is so overkill for gaming unless you plan on playing with yourself i guess.