Ding Ding Ding! Shandia called it. After installing (yet another) replacement RAM set, Phoenix still would crash when I put load on the GPU. I reinstalled OS... no change. I threw in a budget PSU to see what would happen... yep, stable as a rock. So, I'll be submitting an RMA on the EVGA 850 P2 PSU.
RMA Count on this Build: 7