Additional system requirements for 64-bit AutoCAD 2009 include the following:

• Windows XP Professional x64 Edition or Windows Vista 64-bit (cannot be installed on a 32-bit Windows operating system)
• AMD 64 or Intel EM64T processor
• 1 GB RAM, or 2 GB for Windows Vista 64-bit
• 750 MB free disk space for installation

The system requirements for Microsoft ® Windows Vista® operating system or 3D modeling (32- and 64-bit AutoCAD) are as follows:

• Intel or AMD single-core processor, minimum 3.0 GHz
  or
  Intel or AMD dual-core processor, minimum 2.0 GHz
• 2 GB RAM minimum
• 2 GB free hard disk, not including installation
• 1280x1024 32-bit color video display adapter (true color) 128 MB minimum; OpenGL®- or Direct3D®-capable workstation class graphics card (Windows Vista installation requires a Direct3D capable workstation class graphics card with 128 MB minimum)

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