The 7850 needs at least a good name brand 450W PSU, the 7870 needs at least a 500W PSU. Both need the 6 pin PCIe video power connectors. (7850 needs one, 7870 needs two) If your PSU is marginal, or less than required, then the video card may be crashing under heavy video load.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.