To add to the already excellent response I would strongly suggest that you wait until Intel's Nehalem cpu with X58 motherboards come out in Q4 2008 before making the switch from FS9 to FSX. Pricing should be pretty reasonable right off the bat. DDR3 will be significantly more affordable by then too. As you can see from my sig I am running no slouch of a rig but with any complex add on (PMDG 744X, Dornier Do-27, ATR 72-500 etc) I have to limit my settings pretty severely to achieve smooth framerates (25+) on takeoff and landing. Add some scenery add-ons (UTX, GEX etc) to this and things only get worse. If you want some weather this will have further negative impact. I always have all AI traffic (cars included) set at 0% when flying the 747. Screen resolution is another important factor - the higher the resolution the lower your frame rates. SLI/Crossfire has no real world benefit (unless you run a 30 inch monitor perhaps but this is arguable).The reality is that current generation high-end hardware is NOT up to running FSX with complex add-on's using even medium autogen settings, AI, and weather. Next gen architecture should be anywhere from 15 to 30% quicker at similar price points (which is great!) but it will still not be possible to SMOOTHLY land the queen at Mega Airport Heathrow with high settings, weather and AI without some compromise.Just want to add for comparison purposes that I get an even 14,000 in 3DMark06 (on XP obviously with no overclock at all on any components) which is way above average. Crysis runs very smoothly at 1680x1050 on all high settings on my rig. This should give you an idea of how extremely system intensive FSX with complex add-ons is!Hope that helps someKonrad