glxinfo | grep -i render
:$ glxinfo | grep -i render
direct rendering: Yes
OpenGL renderer string: GeForce 9600 GT/PCI/SSE2
GL_NV_conditional_render, GL_NV_copy_depth_to_color, GL_NV_copy_image,
GL_NVX_conditional_render, GL_NVX_gpu_memory_info,