I would think they, or at least the V5 versions will require a powerful CPU to perform software T&L, motion blur and FSSA. At the moment It's just a guess, but the Geforce DDR tends to improve performance of the mid to lower spec CPU's with the GPU.
I will be getting a V5 6000 on release if it gets good reviews so I'll keep this forum posted but I do have a high spec system.
If you are considering Geforce check out the FAQ as there are many issues:-
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