Yeah, you won't be able to run FSX very well with what you have, unfortunately. Like I said, it's not just your CPU. Your graphics situation is very weak, not even meeting the minimum requirements.
I'm not sure what you're running on (a laptop or a desktop), but a video card is in order if you do have a desktop. I'd recommend at least a 500 series NVidia card...relatively cheap and works fine for your setup. Anything more and you'd be throwing money at it...
Like I said in my first post, FSX is a CPU intensive program...and the program isn't modern by any means. It's almost 10 years old!! FSX has the capability of taking the best tuned and tweaked 4.5-5GHz computer to its knees!! So, what you will see in performance from "other games" can't be compared with FSX...it's an apples to oranges comparison.