Hi guys
Need  to put together a high end machine for Acad 2009:
Can anyone recommend
   which 3d accelerator to use
   recommended processor
   any optimization in ACAD to make the best use of the above hardware
   (drivers, patches etc)
 
Thanks

It depends on the size and type (2D/3D, raster images...) of drawings you will process in AutoCAD.
 
Any PC on and above the official system requirements will do. An Autodesk-certfied graphics card is recommended for full 3D functionality.