HD 6850 crossfireX causing PC to crash?

Bickering Whale

Honorable
Sep 6, 2013
23
0
10,510
I got a second 6850 for like 40 bucks to crossfire it with my current 6850 to give me a temporary boost until March next year. When I power up my system, everything works fine. 5-10 minutes later, my screen would start flickering for a few seconds before I get the BSOD -.- Could it have been my power supply? I have an Enermax NAXN 600W PSU with 80+ Bronze certification. Or could it have been something else? I strongly suspect a weak PSU since 600W is kind of pushing it.