i just got a new nvidia gtx 780 with a 750w GPU, a haswell cpu and 8 gigs of memory. when i play any game, for example nba 2k15. for the first couple of minutes, i am stutter free and the game runs really smooth. than after like 5 minutes, it starts to slowly stutter and starts skipping frames for like 1-2 seconds. it gets really annoying. my cpu temps are around 50c and the video card temps are pretty decent too around 45c. I have changed a lot of parts in the pc and i cannot figure out the problem. i had the same issue with my old video card which was a 650 ti boost, but the frame rate was way lower with that card. i am clueless and i have tried little fixed that i found online, and i just came seem t fix the problem. can anyone help?