I have an i5 750 paired with 8 gb ram and 2 gtx 550 ti in sli. Is it better for me to run games at 720p with settings on max or should I run them at 1080p with the settings on medium? What gives me better and smoother performance? Also would I be fine to just get 1 gtx 760 or do I need a new cpu or should I OC? I'm new to pc gaming and need advice. Any help is much appreciated. Thanks.