After I downgrading to Radeon 11.x driver for nearly 5 months, AMD finally released a good enough 12.x driver for the FSX. It is also the choice of Samy Fay who recommended the driver in a comment about his crossfire setup a week ago.
I wouldn’t say the new driver boosts the FSX’s performance obviously. Also my observation is subjective. However, my FSX running under this 12.8 version does give me an impression that it is above the overall level of the last 11.12.
My 3D Application Settings for the new driver is the same. Also, I continue to have the OpenGL
Settings disabled to avoid conflicts with the TrackIR mentioned in Post 150. (I have a few times don’t recall why I have the OpenGL disabled until I encounter the TrackIR issue again when I switch it on.)
Very likely that I will tweak my fsx.CFG a bit with this driver to see if additional improvements can be sought.
For anyone who hasn’t upgraded their display driver for a long time as I did, perhaps it is time to move on to a good new driver.