"The first leaks were that the Phenom II could hit 4 GHz on air cooling alone, though we obviously wonder how extreme that air cooling is. Well today AMD had some actual demonstrations at their gathering, and the Phenom II was able to hit 5 GHz at 1.6v by using LN2 cooling. So with some pretty extreme cooling the Phenom II does show that it has some legs in the clockspeed department. "
http://www.pcper.com/comments.php?nid=6455
http://www.pcper.com/article.php?aid=411
http://www.pcper.com/comments.php?nid=6455
http://www.pcper.com/article.php?aid=411