maybe the slightest bit... most games dont pull anymore than around 2-3gb of ram anyways. so depending what you run in the background it may be a good idea. your hardware is good to go, so i would grab a set of 2x4gb ram (doesn't really matter what brand or type ram is ram..) and dual channel it. like i said, may help a bit
Edit: Like said above. This will not make your details better.. or anything like that, only help the stutter lagg if you have too much running in the background