does geforce 6800, gl 2.0 cards support vertex array objects?
Yes.
It is listed on my GeForce 6800 with driver nVidia 195.36.15 under Ubuntu 10.04 x86 when I run glxinfo:
GL_ARB_vertex_array_object
The OpenGL version supported by this driver is 2.1. The GLSL version is 1.20.
PS: GL_ARB_vertex_array_object has been promoted as a core feature in OpenGL 3.0.
Thank you, 6800 will be minimum for my game