With a NVidia you can't do HDR and FSAA. Is this a driver problem or a hardware thing? I'm asking because I'm building a new rig and getting either a 7900 GT or a ATI X1900XT. In the future I'd like to go SLI/Crossfire and was wondering if Nvidia could enable the option to do both HDR and FSAA at the same time or if I wanted to do HDR and FSAA would I have to upgrade to a next gen card.