I am wondering what single card solution either nvidia or amd, would be equal to 2 6870's in crossfire. I am wanting to play games in high quality at 1080p. I heard that crossfire can cause some micro stuttering and low minimum frame rates.
I am wanting single card because it is easier to power and less hear and noise.
Based on the following two charts, the Crossfired HD 6870 is 9% faster than HD 5970 in general overall performance. The GTX 680 is 15% faster than the HD 5970 in overall performance. Therefore, yes, the GTX can overtake the XFired HD 6870.
Micro stutter is an issue for some people, not all. If you're able to detect screen tearing when playing with V-Sync off, you'll probably notice microstutter too.
here's an excellent deal going on right now: http://www.newegg.com/Product/Product.aspx?Item=N82E168... $80 with promo code, $60 with rebate. I just put these into a friend's rig, unfortunately it has a broken fan control (semi common issue) so I'm in the process of getting an RMA set up. OCZ has been nothing but helpful and is cross-shipping him one now.
If you don't wanna take a chance with that, you have several other options in the price range but they're non-modular.
What I mean by hassle is just dealing with the issues that inherently come with multi GPU setups. Some games don't support Crossfire, leaving you with lower performance. Some games don't play nice with Crossfire but do support it. You might run into micro-stutter. Things like that. Whenever there's more moving parts (not literally), it's bound to have more issues.
That said, 6870 CF offers incredible performance for the price. It's an excellent option for a low price.