It will run. The question is will it run to your satisfaction. You'll have a much better chance if you increase the memory to 4 gig. FSX won't use it all but that will leave some cushion for background stuff. Also, shut down as many of the background programs as you can. There is a freeware program to do that but I can't remember what it is. Someone else will chime in on that I'm sure. I certainly won't hurt to give it a try.
Intel I5-650 @ 3.2 ghz OC to 3.95, 8 gb DDR3 2200 RAM,ASUS P7P55D PRO,
EVGA GTS 250 1gb, CH Eclipse yoke, CH pedals, Track IR, GoFlight GF-46 GF-T8,