Hi all,My father and I have decided to add an additional hard drive with Windows XP SP3, most likely 32-bit. Apart from the fact that I will lose DX10 support and not all 4 GB of my RAM will be recognized, what will be different in FSX while using XP?Just a sidenote, FS9 doesn't work on my system ("Your computer has run out of memory..."), so I'm looking forward to seeing if it'll work on XP.Thanks, sorry if this has already been asked!Regards,

I'm not sure if you'll gain anything. You might want to add the 3GB/switch to your XP installation, so at least Windows will see roughly 3.2GB of RAMFS9 works fine on XP SP3 alongside FSX SP2

add another line in boot.ini with this ' /3GB /userva=2560' without the quotes.my boot.ini looks like below and I can choose which line to use when booting. note there are two lines starting with 'multi'. when system is booting it will hesitate for up to 30 second allowing you to choose which line to use. the second line I always use even for other games. I have 4 gb of system memory. you can edit your boot.ini in system properties, startup and recovery panel.don't do it unless you know what you are doing![boot loader]timeout=30default=multi(0)disk(0)rdisk(0)partition(1)WINDOWS[operating systems]multi(0)disk(0)rdisk(0)partition(1)WINDOWS="Microsoft Windows XP Professional" /fastdetect /NoExecute=OptIn /usepmtimermulti(0)disk(0)rdisk(0)partition(1)WINDOWS="Microsoft Windows XP Professional 3GB userva" /fastdetect /NoExecute=OptIn /usepmtimer /3GB /userva=2560fs9 does have a patch and should run on your system.