The Unigine Heaven Demo is unique in that it is the only demo which allows for the following components in one package:
The ability to compare DX9, DX10 and DX11 in the same environment allows for the unique ability to see when and if additional VRAM comes into play. Previous testing has shown that 2GB of VRAM is needed to run the game in Eyefinity at 5760x1080 with 4xAA, using the DX10 or DX11 codepath.