Yes, for multi monitor, AMD certainly has the upper hand this generation. The GTX 6xx cards are slightly crippled at huge resolutions whereas the 79xx cards have lots of memory and a huge memory bus to aid performance at those resolutions.
As you can see in my sig I own 2 7950s and they kick ass, even for my triple monitor Eyefinity setup.
Does the XFX have a single DVI port or two? If it has two, it most likely has the 3.1 pcb which does not allow voltage changes...not a big deal if you don't plan on pushing the card past 1100 MHz.
Max Supported Resolution (ANALOG):2048 x 1536
Max Supported Resolution (DIGITAL):2560 x 1600
Output - DL-DVI-I:1
Output - HDMI:1
Output - mini DP:2
Output - SL-DVI-D:1
Dual link Support:Y
Display Port ready:1.2
Get a 680. The MSI Lightning can be overvolted (with a BIOS flash I believe) and you get access to PhysX in a few games and a few other Nvidia only bits and pieces (Adpative Vsync, TXAA ect). I went for a 2GB Phantom.
Can you spend a moment explaining your answer? Is it just because I'm using a single monitor, or because you feel the stock 670 outperforms the stock 7970? I'm seeing a lot of mixed advice here. There's also price to consider, the 670s vary widely and I would probably end up getting something like the EVA 670 FTW
At this moment AMD has made vast improvements on their drivers. The 12.11 is in beta but works great. There is a significant increase in results with the latest drivers. Also if the special is still going on you get 3 free games with the video card purchase. A big plus in my book. I usually try and get the best or second best card out there expecting it to give me good game play for 2 to 3 years. Then I usually pick up a second one and Xfire them if I need the power. I don't think you can go wrong with the 79XX line. But honestly it is always up to what your willing to spend at the time you buy and will it achieve what you want or need. I like both Nvidia and AMD but at this time the AMD card is my choice because I was willing to spend what the cards price was and looked at what I was getting. I definitely am enjoying the free games and cannot wait to get FarCry3.