Yeah, your RAM could be the problem, but if it hasn't been built properly, it could be temperature issues too, or your video card.
I'd take it back, and get them to repair or replace it since its new
Or did you build it yourself? If you did, I'd presume the video card to be more the fault than the RAM.
One thing though, there shouldn't be an issue with the graphics card, since BFG auto overclocks the cards anyways to work better, but it could still be the card if somethings not working right. But it could also be the RAM, though this seems less apparent.
I hope this helps
EDIT: Does anyone know if Geforce cards have a VPU recover like ATi cards do that can be switched on to see if it recovers from a crash?