I loaded Vista 64 on a separate partition to run FSX exclusively. XP 64 will not load on this chipset. "Ghandi's Brother" from Dell confirmed this.
Tried every driver WHQLs and Betas. Running nHancer and set up according to Nickn. Made FSX.cfg mods from stickies. I'm getting jaggies on all drivers. I probably need to double check all settings, but I need a concensus on which driver has been the best for Vista 64.