im awaiting my second vtx3d 7870 black to arrive on monday morning but ive read conflicting stories about my cpu. what i would really like to know is will my amd a10 5800k bottleneck crossfire black 7870 le's?? and if so by how much would the fps be lower than a single card and would i be better of trading both cards in for a higher spec card?? or would i be better with one of the amd fx cpus which are fm1 i think and if so do they they fit in the fm2 mobos??