If you suspect it's the video card it looks like your MB has integrated graphics. Remove your card and run a stability test using the on board graphics. As others have said mixing memory isn't always the best have you tried with just one brand or the other?
In the case of the graphics card itself. No. I can't find anything linking a graphics card to this issue. Possibility of a graphics card driver issue. Maybe. Again, I can't confirm specifically. It is listed that drivers can cause this issue, but as to specific drivers, there's not really enough info. You could try updating your drivers or if you already have, try back-dating them. But until the memory avenue is checked and fully eliminated, I can't offer any other suggestion at this point.
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