content: The garbage can is not slower than the old mac pro, except for the fact that you could get an old mac pro with more cpu cores than the trashcan can be specced at and that it is is possible to aftermarket upgrade the video cards in the old mac pro which is unfortunately not possible with the new one. That's the biggest downside to the trashcan IMO, is the lack of card expansion that was possible with the old one; but the size difference is worth it for some people.