IF the rumors were true AND the Ps4 were to use HD 7670 and the Nextbox were to use HD 6670. Who will come out on top?

[raygun]

Your forgetting something, the PS4 will be using an A10 apu and the 7670 gpu. The A10 contains a 4 core cpu PLUS a gpu on one chip, which will be able to work together with the 7670, in effect it will have 2 graphics cards.