Don't let anyone tell you Game Mode isn't needed. I've seen a lot of facepalming conflicting information on reddit of all places, which surprises me greatly. Sure GM off might 'look' way better (more colour pop) etc but you want unprocessed gaming period. My Sammy UE40H6400 looks stunning with GM off, but it feels wrong when moving my Infamous Skaterb0y around the city of Seattle.