lol Metro 2033 is a GPU-eater no need to max it...
And well do you have any other game which require CF6970 besides Metro 2033 ?
Selling a GTX 590 to buy a 6990 ?
590 > 6990 (reference models, not sure about non-ref)
If I could give negative rep for this post I would. You're pretty much completely wrong on all counts.