Originally Posted by Here2Learn
the GTX-670's don't over clock? not happy right now
They still overclock, just no where near as well as you think. Oh, and don't WC GTX 670s. You would have to be a total moron to WC them. It would be a total waste. On the other hand. Water cooling AMD 7970s and overclocking them can yield some amazing performance.
Please don't think I am an AMD fan boy because actually I am nvidia fan boy. But I have the GTX 670 asus overclocked DCU2 card and after overclocking I got a 3 FPS boost......maybe. And that was with a fairly decent OC.
People with 7970s were getting like 10 extra FPS. Maybe you can return your 670s for 7970s or even that geforece titan will be about the same price as a used GTX 670 sli kit and it will be about 10-15% faster than two GTX 680s in SLI with only having a single GPU chip.