I have read elsewhere in this forum that FXs is a "demanding title" which will need some time for hardware to catch up to it. I also read that it is not "optimised" for either dual core CPU's or SLI.Given that SLI has been out for quite some time now (but I don't know how long dual core has been around) -- could somebody advise me just what it is about FSx ( compared to the facilities that FS9 has) that causes it to be so "demanding" For example, I know that the mesh has a higher resolution than FS9 - but I have installed high-res mesh in FS9 and it didn't appear to bother the sim). I also know that it has higher res ground textures - but I can't comment on those, not having seen them.I am not knocking the sim whatsoever as I have not seen it in action yet - but as a person thinking about upgrading my computer to what is available today (ie Dual core with 1 or 2 SLI cards, I am a bit confused as to what to do -- what is it about FSx that it requires hardware that doesn't seem to even exist yet?Thanks Barry

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Check out some hardware forums likewww.guru3d.com or any overclocking type forum.There are many bright people there and some use FS9 and/or FSX.

Some possible reasons1. texture tiles are 1024x1024, not 256x2562. The VC is very detailed3. more fine mesh, as you mentionned4. land visual line-of-sight distance of mountains/tall buildings ,etc...is greatly increased "as visible"and other...