zarx on 11 June 2012
Powerful* enough that a casual observer will be able to easily tell that games on it are not possible on the PS3/X360. There is no point releasing the PS4/Next Box until they can do this without breaking the bank. Which is why this gen has dragged on as long as it has.
* Note this doesn't really have to be technical proficiancy if they can deliver something else that can redefine how games are played, as shown by motion controls on the Wii. But the only thing I can think of (a true brain machine interface) would likely require a lot of CPU power anyway.
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