Regarding DX9 VS DX10 ...
I experience video "tearing" with all my premium aircraft including CS 757, 767, another company 747, JS4100, ect. This tearing ususally starts about and hour into the flight and begins with the crt/lcd displays in the 2D cockpit. I never get this in DX10 and therefore usually always run the sims that way. Default aircraft are unaffected. Have tried a hundred config tweaks.

Intel 9550 quad, 4gigs, 780sli, Nvidia 280, Win 7-64, FSX+Acc Temps seem to stay inline.

Anybody have any ideas on hw to solve the tearing in DX9?

Dennis G