advanced rendering for AutoCAD
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I dont think you can add a 2nd processor to a laptop...
You can buy a new laptop with a quad core processor or if you have a 2nd pc lying around you can try using the render farm.
This kind of thing varies from impossible to very difficult for a regular person to do. The manufacturer of your laptop (or a very good laptop repair shop) should be able to tell you if a processor upgrade is possible-- but it's unlikely. I'd consider a fast desktop for rendering purposes. Laptops with a lot of horsepower tend to overheat anyway when faced with long renderings.
The answer to your question is that nXt is very processor dependent-- the fastest one with the most cores will generally produce the best results.