Hey, I just got my new gtx780 from gigabyte. It's OC version. Before that, I was using xfx hd6870. However, when I try to install the nvidia driver, the system just automated restart. After that, every time I start my computer, it will restart in 10 seconds to 3minutes. I'm using ASUS Maximus VI hero z87 + i7 4770k, PSU is cooler master v1000.