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The new Athlon II is clocked at 3GHz with 1.325V Vcore, the Phenom II is clocked a bit higer with 3.1GHz but with a lower VCore of 1.300V. This is still high VCore with a 45nm CPU, but temperatures are below 40°C when not overclocked. Of course, if your board supports it, you can under-voltage on your own.
![Image Image](http://www.fudzilla.com/images/stories/2009/June/Reviews/AMD_250_550/amd_athlon_ii_250.gif)
![Image Image](http://www.fudzilla.com/images/stories/2009/June/Reviews/AMD_250_550/amd_phenom_ii_550_cpuz.gif)
Overclocking is a piece of cake, just raise the FSB and you are good to go. The Black Edition is multiplier-free, so you can go up without altering any other settings, but where's the fun in that?
![Image Image](http://www.fudzilla.com/images/stories/2009/June/Reviews/AMD_250_550/amd_athlon_ii_250oc.gif)
![Image Image](http://www.fudzilla.com/images/stories/2009/June/Reviews/AMD_250_550/amd_phenom_ii_550_oc_cpuz.gif)
We could boot up both CPUs with 4GHz, but sadly they were not stable. That forced us to stick with 3.9GHz:
![Image Image](http://www.fudzilla.com/images/stories/2009/June/Reviews/AMD_250_550/amd_athlon_ii_250oc3900.gif)
![Image Image](http://www.fudzilla.com/images/stories/2009/June/Reviews/AMD_250_550/amd_phenom_ii_550_3900_cpuz.gif)
The memory is of course overclocked too:
![Image Image](http://www.fudzilla.com/images/stories/2009/June/Reviews/AMD_250_550/amd_athlon_ii_250oc3900mem.gif)
With the amazing MSI board, we could run power efficent Cool'n'Quiet while still overclocking:
![Image Image](http://www.fudzilla.com/images/stories/2009/June/Reviews/AMD_250_550/amd_phenom_ii_550_oc_idle_cpuz.gif)