I have a small pc that is hooked up to my home theatre setup and when I try to run 4k videos it sort of runs jittery and the experience isn't satisfactory, A friend suggested that I'm lacking GPU power that's why videos are lagging, is it really the case? As far as I know CPU causes video playback lag? I have an i5 6500 installed in that pc. Also I'm considering to buy the 1050ti mentioned here is 1050ti overkill for my needs? I only want to play movies and stuff and no games. Other cards mentioned in the article are worthy if we take price in the concern?