Yeah, what I would do is go buy something from Best Buy, and see if it does the same. If not, you know it's a bad PSU. If it keeps crashing, return the PSU and continue troubleshooting. Also, take the GPU out and run off the Mobo. (Do this as your next step for the PSU) If it still crashes then the problem lies in the game itself, the drive, the Mobo, or the CPU.