I stumbled into a thread somewhere on Eovia forums about recommended video cards for Hexagon2. Apparently the techies there are blaming old/cheap video cards for any failings of Hexagon2. Unfortunately the Mac users report real problems with the most modern cards available, too. In any case, does not seem to be an actual list of cards that will work or won't work. About the only thing that comes out is that 128 of VRAM is a minimum, 256 might be nice, and all the stuff that is grayed out shouldn't be selected (!!)