Nvidia released a new DX 10 Demo.
Minimum System Requirements for this demo are:
GeForce 8-Series
Windows Vista
ForceWare Drivers 100.64 or higher
512MB system memory
256MB video memory.
Download
Screenshots provided by PCGH and they have more.
nVidia Releases DX10 Techdemo
nVidia Releases DX10 Techdemo
Not anymore proud owner of a ATi Radeon X800XL ;)