The upgrade to 3ds max 7.5 has been out there for some time for subscription customers. One of the nice features is the ability to use Mental Ray with up to 8 CPUs distributed in your network.
This is a great feature because it gives you much more rendering power at no extra cost. For those who would like to see how it works and maybe set up your own rendering network, here is a small video tutorial that explains the basics of this feature. Enjoy. :)