Update:
Installed the 580 today with the 275.27's forceware drivers.
I must be completely honest here and say that it is truly what i had hoped for.
Bad Company 2 no longer gives me flickering textures (Noticably in Heavy Metal map)! Yay.
Frame rates are steller. Seriously, but the smoothness is amazing.
Another title I use a lot is the DCS flight sim series. On the 5970 it only used 1 gpu (Black Shark), and the gameplay was less than perfect. With the 580 it is constant 50 fps (i locked the max fps in the settings to this, personnel preference), and that is with 2 monitors.
A10 plays equally fine. Smooth.
With the 5970, AA was not rendered/applied on my 2nd monitor, It is with the 580.
I dont know if its me, but the AA seems to be done better with nVidia, hard to describe, but for me it looks far better.
Pleased as punch.
Oh, and its quiet! and running at a nice 37 degrees at idle @45% fan.
AM
So folks, so far I could not be happier. Great card.