Yes, I'm using the proprietary drivers (for a variety of reasons, but CUDA support chief among them) and I had that exact setup for about five minutes.
Using Xinerama forces compositing off, which makes for a less than snappy experience. I have three Dell 3000wfp's and without compositing turned on, the tearing is more than noticeable. I might be able to tolerate it, but I know that it is capable of working nicely (a la TwinView).
Using Xinerama forces compositing off, which makes for a less than snappy experience. I have three Dell 3000wfp's and without compositing turned on, the tearing is more than noticeable. I might be able to tolerate it, but I know that it is capable of working nicely (a la TwinView).