Currently my cpu and ram are bottlenecking my gpu in games like Overwatch. My current setup is rx 580, ryzen 1400, 8gb ddr4 2400. Im thinking of upgrading my 8gb to 12gb to get the dual channel which will improve performance overall, but im not sure if adding 4gb will be as significant as 8gb. Considering ram prices, i would rather go with a 4gb stick.