I would sell your 770 and buy either a 980ti or a 1070. I had a 770 SLI setup for a while and I wasn't happy with the microstuttering and the issues with not all games made for SLI. From what I've read 770 SLI is just as powerful as a 980ti or the 1070 without the issues from running an SLI setup. Once I moved to the 980ti from the 770 SLI, it was a world of difference. I had no more microstutters, less power draw, less heat, and it worked with every game, all the time.