Hi!I

Esteban-welcome! We have a wealth of information stored in our Wiki site which you can find here:http://ops.precisionmanuals.comIn particular, the 747-400X FAQ can be found here:http://ops.precisionmanuals.com/wiki/PMDG_747-400X_FAQAlso, there's some stuff regarding OOMs here:http://ops.precisionmanuals.com/wiki/747-4...%26_PerformanceOOMs have been reported will all aircraft, anywhere in FSX, depending on how much you've "loaded" your application. I'd also invite you to check Phil Taylor's blog athttp://blogs.msdn.com/ptaylor/default.aspxThe AVSIM FSX forum also has some very interesting posts regarding OOMs - search with "LARGEADDRESSAWARE".Ultimately, though, I'd invite you to purchase another 2GB of RAM in order to increase your total to 4GB. WinXP will never be able to see all 4GB, but it will reach 3GB (with the tweak you'll find with LARGEADDRESSAWARE) which should be enough.

Thank you!I

ANd maybe I

Heinz-if you read my answer above a bit more carefully, I mention that XP does not see all 4GB - however, the 3GB (LARGEADDRESSAWARE) tweak makes things a lot smoother when it comes to how FSX behaves.