I have only been involved with FSX for a little over a year but it is grabbing more and more of my time and attention as I read more and have started to choose various add-ons. I've got a pretty nice system but I am looking to optimize it for FSX and am looking to you system experts for advice.MB: ASUS P5N-E SLI CPU: Q6700 quad core @ 2.66GhzFSB: 1066Memory: DDR2 Corsair 2G 1024-6400 running at 5-5-5-18 @ 800MHzGraphics: single EVGA 8800GTXVista 32bitIn order to add an additional 2G of memory, recognizing Vista will only see a little over 3M, I need to drop the memory to 667MHz in order to eveb boot the system (apparently there is an issue with being able to run all 4 sockets @ 800). My question is, am I better off just running the 2G @ 800MHz or will I see an improvement in FSX by adding memory even though I have to drop the memory speed to 667MHz? I am confused by responses I have seen in other forums and things I have brought up via Google and I am trying to understand. Since my goal is to optimize the system for FSX I figure you guys and gals are the best source of information.

My advice: Stick with 2GB unless you change over to Vista64RegardsJim

I posted on this b4. But 2 Gig shoulld do you fine. The problem with going to 4Gig even with Vista is that the videocard and PCI slots ahve there memory space mapped down form the 4Gig end so you loose some of it anyway. Ie if you have a 500meg ram video card you will only have 3.5 gig of ram as the video card uses up the top 500meg of memory space. It isnt actually using the ram, just the addresing but it means that that 500meg of system ram isnt avaliable. Akin to having 2 houses on the same block with only one mailbox fot the mail.

Memory speed (in this range) makes no perceivable difference to system performance. 4 gig @ 667 is much better resource that 2 @ 800. With my old 4 gig/32 bit Vista, I'd run well over two gig in heavy autogen areas. With my current 4gig/64 bit setup, I run well into three gig in the same areas. Wish I'd bought 8. I might yet. If you feed it, it will eat.