

Unlike 32-bit systems, which are restricted to a 4GB RAM limit, the 64-bit version of AutoCAD 2011 can access significantly more memory. This allows for the loading of larger drawings and more intricate 3D environments without the software crashing due to memory exhaustion.
AutoCAD 2011 introduced several tools that leveraged this increased power: Autodesk AutoCAD 2011 -64-bit-
Autodesk AutoCAD 2011 (64-bit): Power and Precision for Modern Design Unlike 32-bit systems, which are restricted to a