The implementation I've had on dual GPUs with nVidia, and now AMD has been overall pretty positive.
Granted if you get dual cards you do really want to know what you are doing as I've had to use nVidia Inspector/Raedon Pro to force different profiles for games that were not doing it right. And you always have to update and wait on SLi/xFire profiles.
But the scaling in general works well and if you have the time to devote and know what you get yourself into it is really the only way to get extra power beyond a $500 GPU.
Sometimes I'd still like to have a 570 or 580 though vs. 6950's.
Granted if you get dual cards you do really want to know what you are doing as I've had to use nVidia Inspector/Raedon Pro to force different profiles for games that were not doing it right. And you always have to update and wait on SLi/xFire profiles.
But the scaling in general works well and if you have the time to devote and know what you get yourself into it is really the only way to get extra power beyond a $500 GPU.
Sometimes I'd still like to have a 570 or 580 though vs. 6950's.