I was thinking of upgrading RAM 4 x 2 GB 1333mhz that i took from my old PC (2 kingston and 2 samsung, working at 8-8-8-24) to G.Skill Ripjaws Z or Sniper (4x4 2144Mhz or 2x8 1866MHz ). I have i5 4690k, Asrock extreme 6, GTX960 (but planning to upgrade to 970 or 980). I have read almost everywhere that i wont be getting much of a difference, will it be the same in my case? Since my ram is older (about 4 - 5 years). I am mainly using it for playing games.