I am no means an expert, but did you hook up the correct pins from the PSU to you 960? Sounds like it might be not enough power issue. Also you can make sure it is seated properly and that your monitor is correctly hooked up to your gpu. 800w is more than enough power for that setup that's why I suggest checking to make sure you have correcly used the right amount of pins. The next step would be to download an find something that is graphically demanding like an Overclocking program and see if it still crashes. Sometimes you get a bad draw on the wafer and have to send it back for a replacement. If you have a backup GPU install that and see if it still gives you the time out error. Hope some of these steps help.