I've been reading these forum toppice than FSX doesn't run on them or something? If i were to get a Quad Core Processor, would it run faster than an Intel Pentium 4 processor, the one i've got at the moment.
The Intel 2 Duo core will run much more efficient than the p4. If you're simply wanting to know which one is better, it's the Duo Core processors. Do a google search on Duo Core vs. Pentium 4 and you'll get lots of useful results.
I'm running a Duo 2 Core E6700 and it's running @ 20 fps with graphics at medium. This is with a poor quality OEM gfx card too mind you.