Hope someone can help me out here, I'm going kind of crazy trying to sort this out.
So I just upgraded from my old GeForce GTX 660Ti 2GB to a brand spanking new GTX 970 4GB(not for FSX's sake mind you) and here I was expecting maybe a little modest boost in performance, but instead I'm experiencing the exact opposite.
Framerates have actually taken a heavy hit, even with DX10 using the Fixer, which ran just gloriously on my 660Ti with all settings and sliders maxed. I even tried deleting the FSX.cfg and letting FSX remake it as well as deleting the cached shaders, and framerates are still down and won't run entirely smooth.
I'm at a loss here, I mean the ONLY thing I did to my system was swap graphic cards and installed the proper drivers, no extra bloatware.