You should get a nice slide show with that rig.
I have... Pentium 4 dual core 3.4Ghz with 2Gb RAM 512Mb PCI Express graphics card (forget which) running on windows XP Pro.
It's awful. If I have all sliders set to about half, it runs well but the quality of the graphics is poor to say the least.
If you haven't bought FSX, I would stick to FS9. With addons available, FS9 far exceeds the quality and enjoyment of FSX... so far.
There are some great scenery addons starting to become available for FSX that actually increase FPS. Be patient, just as when FS9 first came out and it too was fairly poor until the ddons appeared. I'm waiting for DirectX 10 before I completely bin FSX.