Which video card is best?

[Soleron]

Shattered Horizon is a bought-and-paid-for Nvidia game. It uses PhysX to an extent that cripples the experience on AMD cards. It uses DX10 because that was the highest DX level Nvidia supported, though DX10.1 was two years old at the time (AMD 3xxx, 4xxx and 5xxx) and DX11 was two months old (AMD 5xxx).