I've installed the powerdraft driver from the nvidia site, it supposedly boosts your 3d display operations by 20%. However, in my options dialog box it still reverts back to the OpenGL driver. What am I missing? I'm running the nVidia Quadro FX 3500 video card with 4GB ram, 10k hard drive and the E6700 2.66GHz processor but cad is slow in 3D. Thanks for any help.