Good morning! I think I've found the real culprit behind my FSX woes! I'm going to reinstall today. I had been installing the FSX Acceleration Pack which includes SP 2 for the flight simulator plus several additional aircraft. I uninstalled the acceleration pack and the lagging and framing went away. I had a problem with the aircraft appearing to "vibrate" when stationary, but the smoothness in flight was a world better and I could add the desired amount of complexity to the scenery without it totally crapping out on me.
My machine dates back to Aug. 2102, so it's probably time for a new one anyhow.
Is the Xeon processor good for consumer use? I had always been under the impression that the Xeon machines were meant more for server applications. However, if it's good for consumer use,the machine you pointed out sounds like a powerhouse.
The video card I have is full height, full length. It takes up a lot of space.