има 64-bit версия на AutoCAD

http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=11946449

System Requirements
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For 64-bit AutoCAD 2010

* Windows XP Professional x64 edition (SP2 or later) or Windows Vista (SP1 or later) including Enterprise, Business, Ultimate, or Home Premium edition (compare Windows Vista versions)
* AMD Athlon 64 with SSE2 technology, or AMD Opteron® processor with SSE2 technology, or Intel® Xeon® processor with Intel EM64T support and SSE2 technology, or Intel Pentium 4 with Intel EM64T support and SSE2 technology
* 2 GB RAM
* 1.5 GB free space for installation
* 1,024 x 768 VGA display with true color
* Internet Explorer 7.0 or later
* Install from download, DVD, or CD

No pain, no gain