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JEMC said:

Surely you are right, I assumed that both chips had something in common as I read that IBM used some of the knowledge they gained when developing the Cell to develop the chip of the xbox360.

My bad.

Wow.. logic is not your friend, is it? Considering the XBox360 appeared over a year before the PS3, it is pretty obvious the development cycles were at least running in parallel. More likely Sony cut off the multicores from the IBM design line (that ended in the 360) to make room for the SPUs..