Not that FSX allows for much multi-threading to occur, but in the event that some small tasks are processed in parallel (as I understand FSX supports), is it then true that XP Home does not support it?http://www.hardwareinreview.com/cms/content/view/29/29/I was attempting to find some info on RAN useage with dual cores and came across this article.Bruce.AMD 64*2 4500+, 2* 1GB TWINX 3500LL, ASUS A8N32-SLI, 6800GT.

Um, I think the person who wrote that article is DEAD wrong. Or at least, somewhat wrong...First off, I'm running XP Home on my 4800+X2 and it shows both cores in the Task manager, so both are detected and used.Second, I suspect that the issue that is confusing the author is how the OS views "cores" vs "CPUs".... Home will only support 1 Processor with N cores (because multi core CPUs look identical to the OS as the older hyperthreading P4s did, 2 logical cores in 1 Processor.) Professional on the other hand will support up to (I believe it's 4, but might be 2) processors, with each processor having N cores.) Anything above that you need XP Server and/or Enterprise (or is it called Datacenter Edition, I can't remember.)Basically, I think he wrote what he wrote because he tried doing a benchmark comparison test using a dual core Pentium 4, a dual core A64x2 and a 2P Opteron setup and obviously the Opteron 2P setup won't work with Home.--2002cbr600f4i

Thanks- appreciate the feedback.I was actually trying to find out if, with a dual core and 2* 1GB of RAM, if the application (FSX) sees 1 or 2 GB of RAM. It appears as though it would ss 2 GB as the memory controller is shared.Bruce.