Hey Buggy, i promised to reply!
So i went for the Palit RTX 4090 Game Rock and its mind blowing!
The thing is i still have my old PSU with 750W, it made strange noises under load. To get rid of the cracking i had to lower the power target to only 50%!! So the GPU took only 270Watts, thats around 70W less than my RTX 3080ti did!
I can run 4k Ultra now with NO GPU Limitation, the GPU banner in fps counter is green all the way, 10ms frametimes. But im still Main thread limited. So thats why i only reach 40fps TAA in the FBW A320 at airports.
Then Framegeneration kicks in! It DOUBLES the fps without any arctifacts.
So i get to 80-100 fps and its awesome smooth! You still have the microstutters though due to the terrible code of MSFS and the CPU limitation you cant get rid off.
VR i can go 150% OpenXR High End with DLSS Balanced and get around 40-50 fps.
Keep in mind!!! all those numbers are only with 50% Power Target!!!
I havent used the card to the fullest.