I work with a very limited RAM (128), and I didn't encounter any problem so far, even with over 200Megs file with 10,000+ objects (the most crowded scene so far), so... I think you have the amount of RAM that enables you to handle large scenefiles. Save often, specially before importing a DXF or a complex model... I know it could be a pain, specially if the file is very large, but it shields you from nasty surprises. Stefano