If he games vs thread intensive things I would say take a step back with the cpu and bump up the GPUs if that is even needed? Is he running 3D or multi monitor/resolutions????
If running multi monitor AMD has the edge with memory at high resolutions. 3D I dont know enough about it to say who is better, but Nvidia has been in that camp longer. If he is only running a single monitor with no 3D I would say go with 1 680 or a 7970, you only go multi gpu if you have to.
1 single big gpu is less of a pain in the ass then 2 smaller ones.
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