Not much in terms of the hardware needs of AutoCAD 2011 has changed over the past few releases other than supported Operating Systems.
For 32-bit
- Microsoft® Windows® 7 Enterprise, Ultimate, Professional, or Home Premium, Microsoft® Windows Vista® Enterprise, Business, Ultimate or Home Premium (SP1 or later) or Microsoft® Windows® XP Professional or Home edition (SP2 or later)
- For Windows Vista or Windows 7: Intel® Pentium® 4 or AMD Athlon® dual-core processor, 3.0 GHz or higher with SSE2 technology; for Windows XP: Intel Pentium 4 or AMD Athlon dual-core processor, 1.6 GHz or higher with SSE2 technology
- 2 GB RAM
- 1.8 GB free disk space for installation
- 1,024 x 768 display resolution with true color
- Microsoft® Internet Explorer® 7.0 or later
- Install from download or DVD
For 64-bit
- Microsoft Windows 7 Enterprise, Ultimate, Professional, or Home Premium, Microsoft Windows Vista Enterprise, Business, or Ultimate (SP1 or later), or Microsoft Windows XP Professional (SP2 or later)
- AMD Athlon 64 with SSE2 technology, AMD Opteron® processor with SSE2 technology, Intel® Xeon® processor with Intel EM64T support and SSE2 technology, or Intel Pentium 4 with Intel EM64T support and SSE2 technology
- 2 GB RAM
- 2 GB free space for installation
- 1,024 x 768 display resolution with true color
- Internet Explorer 7.0 or later
- Install from download or DVD
Additional requirements for 3D modeling for both 32 & 64-bit system
- Intel Pentium 4 processor or AMD Athlon, 3 GHz or greater; or Intel or AMD dual-core processor, 2 GHz or greater
- 2 GB RAM or more
- 2 GB hard disk space available in addition to free space required for installation
- 1,280 x 1,024 true color video display adapter 128 MB or greater, Pixel Shader 3.0 or greater, Microsoft® Direct3D®-capable workstation-class graphics card