Even on Windows it's not worth it IMHO. Photoshop's 10-bit support is pretty weak, too often the screen doesn't refresh correctly and gets redrawn in 8-bit mode. I don't know if it's Adobe's fault or Microsoft's, but it just doesn't work well, at least not in Windows 7. It also forces the Windows desktop into Aero Basic mode.
If you really want to try it, the AMD FireGL cards are supported.