se lo dite voi :D
"GTX 480 is around 80% faster than the HD 5870 in Direct3D 11 and is around… 190% faster in OpenGL 4.0"..
[Test] OpenGL 4.0 and Direct3D 11 Tessellation: GTX 480 vs GTX 470 vs HD 5870 vs HD 5770 - 3D Tech News, Pixel Hacking, Data Visualization and 3D Programming - Geeks3D.com