Silverbird,
Wow! I can't even run FS9 well with 2 gigs let alone FSX. That was based on my personal experience but if you have FSX running well on 2 gigs of memory then more power to you. Especially if you have Windows Vista which is a memory hog in itself!
You're kidding, right?
My setup (until Friday):
Gigabyte GA-MA770-DS3 motherboard
AMD Athlon64 X2 4000+ Socket AM2
2GB DDR2 PC6400 memory (OCZ 5-5-5-18, 1.8v)
15GB Maxtor 7200rpm EIDE (OS only)
200GB Maxtor 5400rpm EIDE (programs only)
200GB Maxtor 5400rpm SATA II (Personal Files, FS9)
eVGA GeForce 8800GT 512MB
Windows XP SP2
I've locked to 65FPS, and all sliders maxed. 2GB is more than enough for FS9.
BL.