[Codex]

You can find a ton of reviews which will show one brand beating the other, but at the end of the day I go with what I find is best value for money for my needs.

I was planning on getting two 670s because I wanted to try out nVidia after years of buying ATI, but here in Australia both the 7970 and 670 are virtually the same price, the 680 is about $200 more on average. Because I have triple screens and the 7970 as more VRAM it was my choice.

If you're looking at the 670 or 7970 and have a single screen, even a 32", either of them would be good cards for CloD.

P.S. As for overclocking, if the manufacturer decides to increase the clock speeds of the reference cards, then the new speeds become the standard. The point is the 7xxx range of cards have enormous overclocking headroom compared to the 6xx nVidia cards, also the nVidia cards automatically overclock themselves when under load, so the argument about either brand not sticking to defaults clock speeds is mute.