Well I can speak for the EVGA 6800 Ultra since I just installed it in a friends computer and did a fresh install of everything XP, FS 2004 and of course got all of the latest drivers prior to doing the wipe and reinstall.

In comparison to the ATI 9800XT that he had in the system before the 6800Ultra it does SMOKE (meaning FS9 runs extremely smooth by comparison) and the real oddity about it is that FS9 runs on this card better with sharper details of the scenery and textures in (get this) default setting in FS9 than it does with everything pushed up high all of the Scenery and textures seemed washed out with it set on the high settings but in the default settings the scenery and textures are clear and sharp.....

I keep thinking there has to be a setting I'm doing that isn't right or something that makes FS9 do that on the high settings.

I would love to see a good profile made for the 6800 cards for FS9  (with the new drivers you have the options of selecting pre-configured profiles for a game and some are included with the drivers for the more common games and you can tweak those profiles as well).

There are significant differences in the 6800GT and the Ultra and the biggest difference is in the Memory Speed.

Of course we were trying to get the Asus 9999Ultra but have benn unable to get itsince Asus informed us that they had no dates set for the release of the Ultra and the first available card was the EVGA so that is what we ended up with.

Marco

Oh and if you really are struggling to get good performance go here:

www.fs-gs.com

I guarantee once your system is setup by these guys it will be cleaner and run a hell of a lot better, faster and smoother.  Well worth the money