Thanks Tim and everyone who has replied. I have ordered another 2 Gb of ram, but excuse my ignorance; what is PAE and how do you enable it?Richard

Guys,OOM errors have nothing to do with physical memory, nor do they have anything to do with the size of your swap file and increasing your VM to 6 gigs will have absolutely NO impact on the error you are facing. I really do not want to cover what has been covered 1000 times before on the forums so all I ask is that you search the forums for OOM or Out of Memory and do some reading. It can get a bit bland and technical at times but it is also extremely informative. The boot.ini tweaks are good band aids to the problem but the real fix is a 64 bit O/S that does not share the 32 bit limitations. With FSX SP1 I believe MS made FS LARGEADDRESSAWARE and with FS9 you can manually make the change to the FS9 executable to also make it LARGEADDRESSAWARE but the combination of a 64 Bit O/S and a LARGEADDRESSAWARE file should virtually eliminate ALL your OOM issues. On my systems the /3gb switch always caused a tremendous increase in stuttering that was eliminated by moving to XP64. Cheers and good luck,-Paul

Guys,OOM errors have nothing to do with physical memory, nor do they have anything to do with the size of your swap file and increasing your VM to 6 gigs will have absolutely NO impact on the error you are facing. I really do not want to cover what has been covered 1000 times before on the forums so all I ask is that you search the forums for OOM or Out of Memory and do some reading. It can get a bit bland and technical at times but it is also extremely informative. The boot.ini tweaks are good band aids to the problem but the real fix is a 64 bit O/S that does not share the 32 bit limitations. With FSX SP1 I believe MS made FS LARGEADDRESSAWARE and with FS9 you can manually make the change to the FS9 executable to also make it LARGEADDRESSAWARE but the combination of a 64 Bit O/S and a LARGEADDRESSAWARE file should virtually eliminate ALL your OOM issues. On my systems the /3gb switch always caused a tremendous increase in stuttering that was eliminated by moving to XP64. Cheers and good luck,-Paul

Paul is absolutely right that the best way to go is a 64-bit OS with 4Gb or more of RAM. But he is wrong to say that the swapfile is irrelevant. As this is the very point which I anticipated would crop up, let me suggest that anyone interested looks at this article:http://support.microsoft.com/kb/892610/en-usBut if that does not convince you, then try for yourself. Disable your swap file completely, then run the MD-11 with high settings with some heavy scenery add-ons, and see how far you get without running out of memory (assuming you only have 2Gb or even 4Gb) whether you have a 32-bit or a 64-bit OS.But as you say, this has been gone over many times. Having said I didn't want to start a debate, I will not participate in one. The point has been done to death, in fact, and having "done my bit" to try to point out what I believe to be the correct analysis, I'm bowing out and will leave to others to judge for themselves.Tim

Did you apply the change that I suggested? It worked for me and my rig is virtually the same as yours.

Hi Keith, I have applied the change and hope to try again tonight.I am bemused by the amount of discussion my problem has generated, but ever grateful to all who have contributed and will try all the suggestions made and report back.Richard

Dude. We went over this before. That program will NOT solve Out of Memory issues. I gave the exact technical reasons why, in my post on this thread: http://forums1.avsim.net/index.php?showtopic=246369

Sorry, I just have it installed. And I have monitored my RAM usage, it has greatly fallen since I installed it. And I havent experienced an OOM or other crashes with the MD11 ever since :)

Physical RAM usage has nothing to do with OOM errors in FSX - it's the User Virtual Address Space that's the issue. The only 100% sure-fire fix is 4+GB of RAM in Vista or Win7 x64.

Physical RAM usage has nothing to do with OOM errors in FSX - it's the User Virtual Address Space that's the issue. The only 100% sure-fire fix is 4+GB of RAM in Vista or Win7 x64.

Hi Ryan, are you then saying that there is a high probability that anyone running the MD-11 in XP can expect freezing on account of oom's? Richard

Hi Ryan, are you then saying that there is a high probability that anyone running the MD-11 in XP can expect freezing on account of oom's? Richard

No, I personally never saw an OOM with it in XP (I'm on Win 7 x64 now though). I'm saying that the only true way to mitigate the problem if you are having it is to go 64 bit with a lot of RAM.

I am almost out of patience with these OOM errors. I have tried all the suggested tactics including the 3G switch as well as the cleanmemory app but nothing works. I am running a fairly decent machine and I would llike to think the specs other than XP are way above what is required:Q9400 Quad 2.66GHZ4GB RamNVidia 9800GTXP Pro Service Pack3FSX SP2And I still get these errors. Most of the time it when I have Active Sky Advanced, and the PMDG 747 running together. Today I got the error after an 11 hour flight from cape town to london as I was on final ...(so a little annoyed).Not sure what else to do other than bite the bullet and go vista 64??...

You could try XP64... or wait until the end of the year for Windows 7...Andrew

I am almost out of patience with these OOM errors. I have tried all the suggested tactics including the 3G switch as well as the cleanmemory app but nothing works. I am running a fairly decent machine and I would llike to think the specs other than XP are way above what is required:Q9400 Quad 2.66GHZ4GB RamNVidia 9800GTXP Pro Service Pack3FSX SP2And I still get these errors. Most of the time it when I have Active Sky Advanced, and the PMDG 747 running together. Today I got the error after an 11 hour flight from cape town to london as I was on final ...(so a little annoyed).Not sure what else to do other than bite the bullet and go vista 64??...

Win7RC 64-bit is free for about another year. It works just fine. Why not backup everything and give it a go? With Win7RC 64-bit, FSX SP2, 4Gb RAM and the system controlling the swapfile (ie, don't fiddle with it!), it's like Ryan said: you won't get any OOM errors: period.Tim

The only OOM error "cure" for me was switching to a 64bit OS (in my case Vista 64bit).Vista 64bit is the best addon I got for flight simulator.Al Stiff

I am almost out of patience with these OOM errors. I have tried all the suggested tactics including the 3G switch as well as the cleanmemory app but nothing works. I am running a fairly decent machine and I would llike to think the specs other than XP are way above what is required:Q9400 Quad 2.66GHZ4GB RamNVidia 9800GTXP Pro Service Pack3FSX SP2And I still get these errors. Most of the time it when I have Active Sky Advanced, and the PMDG 747 running together. Today I got the error after an 11 hour flight from cape town to london as I was on final ...(so a little annoyed).Not sure what else to do other than bite the bullet and go vista 64??...

I can report that for me, increasing ram to 4Gb + 3g switch together with cleanmemory seems to have solved my oom error, at least for up to 2 hours flying. Tonight I will leave flight overnight and se what happens.Richard

I can report that for me, increasing ram to 4Gb + 3g switch together with cleanmemory seems to have solved my oom error, at least for up to 2 hours flying. Tonight I will leave flight overnight and se what happens.Richard

Flew all night and paused at tod as requested with no freeze. Maybe upgrading to 64 bit OS is overkill?Richard

Flew all night and paused at tod as requested with no freeze. Maybe upgrading to 64 bit OS is overkill?Richard

Thanks RichardCan you tell me what aircraft you were flying and with what other addons. If I fly with the standard aircraft, I can go on for hours. I seem to get the error when flying the PMDG 747, sometimes with Active Sky and Fs2Crew... in the mix there as well.I also noticed at one stage that FSX.exe was using 1.5mb of memory

Thanks RichardCan you tell me what aircraft you were flying and with what other addons. If I fly with the standard aircraft, I can go on for hours. I seem to get the error when flying the PMDG 747, sometimes with Active Sky and Fs2Crew... in the mix there as well.I also noticed at one stage that FSX.exe was using 1.5mb of memory

I was flying the MD-11X and I have no envirenmental addons, only pmdg planes and the LDS767 Richard