There are DVI DualLink Y splitter cables like this one. Although I am not sure this very cable can do the trick. jemo07 can answer that.
But it will likely come down to the drivers what a graphics card really supports. I can imagine that mimicking a 3840x1200 display split onto two 23" ACDs is easier to support than two totally different resolutions.
You might also have to use an application like SwitchRes to activate more graphics modes than OSX provides by default.
But it will likely come down to the drivers what a graphics card really supports. I can imagine that mimicking a 3840x1200 display split onto two 23" ACDs is easier to support than two totally different resolutions.
You might also have to use an application like SwitchRes to activate more graphics modes than OSX provides by default.