I would never run my system without some amount of Pagefile. http://blogs.technet.com/b/markrussinovich/archive/2008/11/17/3155406.aspx

Have to get to work now, but I'll read it when I get time - just browsed through it - interesting read!

Each 32-bit application can require 2Gb of virtual memory. Four of those can more than fill 8Gb of RAM, alowing for RAM used by the system and graphics.

I thought FSX was more a of a CPU intensive software anyway - i.e. this has the greatest effect on performance. Obviously RAM comes in to it at some point, but certainly from my perspective increasing my RAM capacity made little difference to the overall performance of the simulation. However overclocking seemed like my machine had been given a steroid injection.Tom

I thought FSX was more a of a CPU intensive software anyway - i.e. this has the greatest effect on performance. Obviously RAM comes in to it at some point, but certainly from my perspective increasing my RAM capacity made little difference to the overall performance of the simulation. However overclocking seemed like my machine had been given a steroid injection.Tom

More RAM will not in itself provide any more performance unless of course the system was starved of it. i.e. 4GB will perform the same (or in some cases worse)than 8GB as long as more than 4GB is not called upon. Reason I say 8GB can (not will) perform worse is more RAM can result in a lower ability to overclock. More RAM can mean it takes more (depending on number of slots used 2 vs. 4) and other factors require more voltage and more latency than say 4GB.However, having 8GB vs. 4GB RAM in a 64-bit OS, canbuy piece of mind by ensuring that a 32-bit program has full use of all 4GB RAM that it can utilize and other programs that you may be running can have full use of the additional 4GB RAM; however unlikely that any average user especially one of FSX will ever require more than 4GB RAM. Only reason I run 8GB RAM is because they didn't have 4GB when I bought it or I would be on 4GB right now.In FSX performance from greatest to least: CPU, RAM timing and frequency, Video and HDD.

No matter how much memory you have in your system, FSX is still a 32 bit program and will be limited in usage to slightly less than 4 GB on a 64 bit system. The OS will allocate memory according to the program's need up to that point.DJ

I thought that one of the service packs enables FSX to use more than 3.25GB... or maybe it lets FSX use up to 3.25GB. Maybe I'm mixed up there

I thought that one of the service packs enables FSX to use more than 3.25GB... or maybe it lets FSX use up to 3.25GB. Maybe I'm mixed up there

In one of the service packs the Aces team set the LARGEADDRESSAWARE flag in fsx.exe, allowing FSX to address memory beyond the default 2GB limit in a 32-bit system. The user needs to set the amount of additional memory with the /userva switch before LARGEADDRESSAWARE has any effect.A common value is /userva=2560 which assigns 2.5GB to FSX (and other user processes).

In one of the service packs the Aces team set the LARGEADDRESSAWARE flag in fsx.exe, allowing FSX to address memory beyond the default 2GB limit in a 32-bit system. The user needs to set the amount of additional memory with the /userva switch before LARGEADDRESSAWARE has any effect.A common value is /userva=2560 which assigns 2.5GB to FSX (and other user processes).

So if we manually set the LARGEADDRESSAWARE flag like is done with FS9, could it be enabled past 2.5GB and up to 4, 6, or 8GB?