So have pretty much been playing Flight Sim X over the last week and tweaked the graphics.  They say that if you get over 10fpx with FSX you are doing well.  Mine average about 20, fluctuating from 10 to 50, giving a pretty fluid simulation.  I run a I3 Dual Core at 2.3Ghz with 4GB of ram.  The graphics is the built in HD3000 solution and I am constantly amazed by this GMA chipset.  It runs pretty much you throw at it, so long as you spend a while tweaking.  There are parts of FSX that you really wouldn't be able to tell the difference of it being a real video.  Check out some of the flights I have done over the last week or so.