Rendering Tips in Revit 2009/2010

One question that I encounter recently goes like this. We understand that Mental Ray rendering in 3ds Max would be rendering in random box (called bucket), this bucket actually indicate that how many processors are being used in the rendering. So, for a Dual Core processor, there would be two buckets running on screen. In the same way, Quad Core processor would display 4 buckets when rendering. Now, Revit rendering also employs Mental Ray technology, why you cannot utilise all the 4 cores in the rendering?

The answer is this:
Revit rendering do not exactly employ the same technology even though it is said to be Mental Ray based. So, the Revit rendering does utilise all the 4 cores but it only shows 1 bucket while rendering.