Go to Control Panel > Device Manager > Display Adapter . Right click on driver and choose Update. See if things improve. Good specs does not mean you won't crash, you need correct and up to date drivers.
Agreed, PSU info would be very useful as it is an often overlooked but critical component. If this is happening in all games the PSU could be the issue as the GPU is one of the biggest power draws in the system.You haven't mentioned it, but what is the make and model of your power supply. Also, what are the temps in your system (especially the CPU and GPU.)
Finally, use reference drivers. Those are the drivers supplied by Nvidia. You can get them from www.nvidia.com.