I agree with camerongray on that PC, I personally use autocad myself on intel laptops and desktops and for the most part, they never pass 50 of my cpu load. If you do purchase camerongrey's pc suggestion just plan on investing on an extra 4gb ram card if you are going to do any heavy autocad (or similar program) editing. The last thing you want is for your computer to start using virtual ram while rendering a large model.