I'm struggling to see the differentiator here. They've achieved some impressive numbers due to the interconnects used between the IBM hardware and the use of the next generation of PCI bus. And are comparing this to the existing generation of x86.
Don't get me wrong - I'm a fan of Power, and the excellent but expensive Flashsystem is IBM's only 21st century storage (the rest is 1990s vintage being dragged out mostly by marketing). I just can't see what they're doing that others couldn't equal.