The original Barcelona is a 65 nm part and really the first of its architecture. Since its release and the subsequent shuffling around of design teams, AMD has refocused their energy on delivering a design that would not only have a better per clock performance than the older part, but allow the design to scale in clockspeed on AMD's new 45 nm process. So far what we have seen shows that AMD has done very well. While the 3.0 GHz Phenom II will likely not perform anywhere near that of the new 3.2 GHz Intel i7, it will show very well against the older Intel Core 2 quads. Not only that, but we will see how AMD scales clockspeed in the future, as well as how they handle DDR-3 support early next year. With AMD's constant process improvement program, and tweaks to the Phenom II design that we typically see in the manufacturing stage, AMD could theoretically have a 3.4 to 3.6 GHz processor at moderate TDP levels (think 125 watts) that would more adequately perform against the mighty i7 within the next 8 months.
...
The Phenom II reached 6 GHz+ at 1.9v on liquid nitrogen (boiling point -321F/-196C at 1 atm). Testing looks to have been done on a Gigabyte 790GX motherboard that is currently available.

Einem japanischen Overclocking-Team gelang es nun, den Takt von 4x 3,20 auf 4x 5,73 GHz zu hieven. Zuvor hatte man sich an einem Core i7 940-Prozessor versucht, der sich bis 4x 4,44 GHz ubertakten lieB.