I can't work out what is causing the BSOD. I've overclocked most of my components and they are all appropriately cooled. Not sure if this is a software issue or not.
If you say so, but the only way to rule it out even after passing prime95 is to return to stock and see if the system stabilizes. It could be the combined load of the gpu's plus the overclock that are doing it. So my suggestion still stands.
if the respective BSOD occurs you can take a picture with your camera while the BSOD is displayed...
you can upload it here to let us see the information it shows ...
It is very important to see this picture ... trust me!