AMD to launch desktop Bulldozer "Zambezi" at E3 Show in L.A. (June 7-9)

[XRL8]

Youre oversimplyfying everything ;-).Youre talking about theoretical thoroughput not "performance".
And while yes its very rare, you can have higher than clockspeed increase boost in performance.
Computer system is very complicated software/hardware "organism" ,with the amount of complexity it becomes harder and harder to predict.
Example:

http://www.legionhardware.com/images...70/L4D2_02.png
Look at the 2.2 to 2.4ghz increase, actual "bench" score goes higher than the increase in clocks.Most probably at 2.2 cpu was running to slow and was choking rest of the system.
In some crossfire situations you got more than 100% scaling also.It happens.
That is OT though, "performance" is a real life metric, its not thoroughput.So if AMD States 40% higher performance, you can be sure it will get in atleast one scenario 40% higher real life SCORE than phenom II did get.