boulbox :
Nothing really besides performance.
Also that the rumor that AMD is going to focusing on the drivers instead of releasing a new GPU(drivers is where AMD falls behind and by focusing on it, it will try to make it perform a lot better)
if you want to get the 670, go for it. It is a solid card and helps in video editing because of CUDA cores which actually does something inside their cards.
Of course if you do go with the 670, make the PSU go down to a 750W since it uses less power than the 7970.
Both are solid cards and choices. I would just prefer the 7970 because of the raw performance and because it is much better than multi monitor/high res gaming solutions(by high res i mean bigger than 1080p, something like a 1440p monitor)
This happens to be so because the 7970 has more Vram which helps a lot in those kinds of scenarios
I'm not planning on going multi-monitor any time soon. I've been gaming on 21"-22" monitors for my xbox for the past 3 years, don't feel like getting motion sickness and headaches trying to adjust to a 3 monitor setup for gaming. on the other hand, i would go 3 monitors for multitasking, but not gaming. i.e. Minecraft on one, wikia on one, and youtube on another.
As far as video editing/rendering, if i did happen to get a capture card, it would be after I picked up a second GPU. Nvidia is something that I've grown up with and I like the thought of the Physics (however its spelled, too lazy to look up). I know EVGA has a 3 year warranty, and ASUS/Gigabyte has good warranties for their mobos (had a mobo three years ago that had a dead connector somewhere on the board, they replaced with a newer model at no charge since the board was still in warranty by a few months.) stuff like that makes me always lean towards what I know (as far as companies) is good. its just sorting out the different models of each product from those companies that aggrevates me.
I know the AMD cards will have better performance, but like I said, I've grown up with Nvidia, so I'll most likely stay with them for awhile.
From what I've heard, the 680 is the fastest card, but I've also heard that it isn't worth the extra $100 if I'm getting an overclocked 670. I don't know what the significance of the extra CUDA cores will do for me, but thats all I see the extra $100 would be. Now is someone said that the extra ~100 would mater, then I'd get a 680, for now, I'll stick with getting a OC 670.
I like the EVGA 670 FTW Sig2, for the factory overclocks, the two blower fans, and the backplate. If someone can convince me of an alternative, go ahead and try. When I first looked at getting a rig from my tax return, I thought i7, 680, Sabertooth, with H100. A few months have gone by, and new products have emerged, along with price changes.
Please let me know what you think I should change without spending way too much, as in adding to the price of my current build.