Which is obviously the difference. As with two cores your pushing twice as much data through the one socket where as with duel processors you have two sockets so it's potentially twice as fast.
Potentially, but not in practice. Here is some random tests done on a dual core mac vs a dual cpu mac.
http://www.macworld.com/news/2005/10/25 ... /index.php
Bear in mind the dual-cpu model lowest is a 2.7GHz model. Look at the 2 2.3GHz scores. They are more comparable.
