Both the CELL and 360 CPU scale up very easily.
However its more useful for developers to get the same number of cores/CPUs running at a higher clock rate - than hold the clock rate, and just increase the cores.
Much of the difficulty from here onwards is going to come to scaling video cards - and power consumption.
Its going to take a *very* long time to properly tap both the PS3 & 360 anyway - Ninty has by far the easiest upgrade route.
Next-gen will be all about controllers and features anyway.
Gesta Non Verba
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