Martin, 2GB is RIGHT on the cuff for XP10 and anything "nice" to look at. Given your rather custom setup (scenery, plug-ins, higher end aircraft), I think you're pushing your setup pretty hard. This is not a common issue. In fact, I can't even remember the last time I heard of some kind of an OOM issue. Wish we could help more, but I think you're going to need to tinker more on your end. Try a fresh demo install of X-Plane, or a full "vanilla" one with the Saab and see how you go there.