Recently replace a GPU in my computer and the computer seems to restart after awhile in windows. I don't know why, it just seems to happen randomly. Regardless of being in idle or underload. The card it had was a gtx580 the card that is now in there is a gtx780. I used a corsair 750PSU, both GPU needed a 6 pin and 8 pin connector. I tried removing drivers and such and downloading them again just to see if there was any conflict. Temp for each wasn't going above 90 degrees either. I used the GPU in a seperate computer as well and it seem to work perfectly fine. I am at a lost at what to do.