Some advice on an upgrade choice please..
 

So, I got 2 6970's in crossfire and I game at 1920x1080 and am looking at possibly getting a 7970 or a gtx 670/680
Is this worthwhile...or am I not gaining anything in terms of frame rates? The only game I play is BF3
Opinions and/or experiences are greatly appreciated

If the 6970's are working fine for you in BF3, I can't see there being much of an increase in performance in going from 6970's to a 670 or 7970. About the only thing you would get from a new card would be a reduction in power consumption and fan noise perhaps.

I agree with dandelioneater.

Maybe wait until BF4 comes out to upgrade.

pretty much what everyone above me said, less noise, less heat, less power.

If you don't care about any of those then stick with what you have.

Agree with others.