"Upgrading" from FSX to FS9

I was reading a post in another section of the forum and someone mentioned something I had never thought of - running FS2004 instead of FSX. It makes some sense; instead of upgrading your PC for tons of money to run FSX well, just switch to FS2004. Does FSX really require that much more RAM/CPU power, etc. than FS9? My specs:
Intel Quad core @2.66GHz
4 GB RAM
Nvidia GeForce 9800GTX+ (512 MB)
I can get 30 fps with decent settings on FSX, but I have to keep the traffic low and there are definitely tradeoffs. How much better would my system run FS9?
I would greatly appreciate anyone's input.
Intel Quad core @2.66GHz
4 GB RAM
Nvidia GeForce 9800GTX+ (512 MB)
I can get 30 fps with decent settings on FSX, but I have to keep the traffic low and there are definitely tradeoffs. How much better would my system run FS9?
I would greatly appreciate anyone's input.