My days of endless tweeking are behind me but I stumbled across this post.

http://www.sim-outhouse.com/sohforum...X-11-July-2012

There was AA mode that I never bothered even attempting but as you know FSX sometimes likes things that goes against logic.

AA_MODE_METHOD_SUPERVCAA_64X_4v12

(http://forum.avsim.net/topic/330328-...s-worth-a-try/) I then read through this post with more detailed info.

I have a old I7 @ 2.7 with 6 gigs ram,Vista 64,660TI card, 32 inch lcd tv @ 1920x1280/1080p. Not a latest tech hotrod by any means but changing to this setting made a nice difference.
FSX looks very clear,no jaggies,smooth at a locked 25.I have just about every addon known to man.Gex,Fex,Activesky,UT ect.

So if you have a fast card with lots of memory imo is worth trying.