This is off topic for this thread but the difference is that the Gekko/Expresso architecture is much more efficient at parallel processing than x86. The PS4's and Xbone's inefficient x86 architecture forces them to have a high number of cores so they can "hack" parallel processing into an architecture that was never designed to have it. Expresso was built for it, which may explain why it was able to run games designed to run on 3 360 cores on its main core.
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1) IBM considered putting multiple cores in GCN. They decided to go with a Superscalar design instead (I actually had no idea what that meant but then I Wikipedia'd it...)
Erm. Pardon me, but I'm going to be very blunt...
Processor architectures are extremely complex systems. To make such a broad claim (that x86 is inefficient and that parallel processing is 'hacked in') is a gross display of ignorance. If you were to make such a claim, it would require substantial evidence to support it and sound reasoning. You provide no such evidence or reasoning.
You are also claiming the reverse is true for the espresso CPU - again with no evidence other than anecdotal correlation.
The problem I have with this, is that many people read these forums with a goal of learning or finding clarification - and often take a post as trustworthy when they themselves lack the knowledge to properly understand the content. In more blunt terms; I fear people will believe you.
Further, you later show that you lack understanding of a fundamental processor architectural feature (superscalar) and additionally selectively quote wikipedia in a misleading way... I'm really not sure what to say. If you do not understand supersclar, then honestly what made you feel qualified to make such broad and sweeping statements earlier?