I am really looking for some help right now. I had an old i5-620 CPU with a GTX465 and it ran FSX JFK, all sliders maxed out, @ 5 FPS. Now to the bad part. I just "wasted" $3000 on a new system (i7-990X 3.46GHz w/ GTX580 and 6GB of RAM, Intel DX58SO motherboard). As it looks like, this system is supposed to run FSX like a dream. But for some reason that's not the case. I loaded up JFK with maxed out settings and got 13 FPS!? I never expected that. I mean someone on YouTube posted a video of the same place (JFK), maxed out, on an i7-980X with at least 39 FPS. I don't get this! Besides, I added an affinity mask (63 and 144, tried them both with no use)... I really need some advice as I'm about to throw this thing outta the window!
I really appreciate anyone helping me here. This really bothers me only because I spent a whole $3500 getting this system, only to find that there is no improvement.
EDIT: Just discovered something, @JFK, I reduced traffic to 0% and the autogen to NONE and got exactly the same framerate... really weird! Is FSX screwed???