Device manager reports 3.50GB of RAM Physical Address Extension What is actually fitted is 640Kb base memory plus 4096Mb extended memory according to the Bios record. I haven't tweaked anything yet. Windows XP Professional SP3 plus FSX SP2 plus Horizon Gen-X version 1 with Volume 3 "flooded Lake District" patch all otherwise "out of the box", as it were. Peter > *From:* Gerry Winskill <gwinsk@xxxxxxx> > *To:* jhb_airlines@xxxxxxxxxxxxx > *Date:* Tue, 11 Nov 2008 13:51:16 +0000 > > Peter, is this using a mod to the FSX.cfg file? If so, what line > have you entered and have you avoided the crashes that some users > mention? I understand that's caused by insufficient memory being > reserved for XP. > > Gerry Winskill