John Carmack of id software updated his plan this past week with an detailed look into the current state of NVidia's and ATI's video drivers and cards... see the plan for the details, but in the end:
I can set up scenes and parameters where either card can win, but I think that current Nvidia cards are still a somewhat safer bet for consistent performance and quality.
as well, he reminds us that the Geforce 4-MX is not the gaming card you want for Doom3...