Hi Stephan,
normally a single DSFL-task needs not more than 64 MB, my own experience under several different windows-platforms. But keep in mind that every driver, every other program you run and even the operating system itself needs memory. So if you have 256MB of free RAM if your system is up and running, you are on a safe side. The requirement for RAM is the amount of free RAM a task needs for proper processing, independent from the size of your installed amount of RAM-"hardware". 256 MB in this case could be not enough, depending of the things i told above. And for sure, linux maybe the better choice of your running os, if you have a very low amount of RAM, often it's simply doing a little bit better work if it comes to the point of insufficient RAM.
So check your amount of free RAM under typical running conditions, I am very sure there is far far less availabele then 256 MB. There is no need in changing the requirements here in my opinion. If low RAM is the problem of your invalid or errored results then you have 3 choices. Install more memory into your machine, decrease the amount of simultanously running programms/drivers or you have to switch to another project. As far as I know, the only project needing explicit less RAM is HCMD Phase 2 here, don't know if it is still running. You can also try other projects except CCW, CEP 2 and DDD 2, these 3 projects needing much more than 250 MB.
Hope this helps?

Cheers Andi