@fei-hung,
I believe, its mainly a difrence in design philosophies. sony went down the road with ibm in the ppc branch that specific sets for specific task can bring more power, more percicly. xbox went with ibm down the general core more flexable, but at top end performance cost.
the power that comes out of either will never reach theorectical peaks due to lack of ram, and motherboard bottlenecks
the specific sets, has been shown in the past to provide vast benifits (adobe products on mac platform), but most developers avoid, or seem not willing to pay for it. (one of the major reasons for apple abandoning powerpc)
Ms went with a general core, as they had seen benfit from that in the world of x86, so seemed to make scence for the same with powerpc make acesing power easy (they stripped the powerpc core they use from most of its complex functions ) the down side is their core has fewer tricks to bring more power out
to add to this nintendo, uses a solution very similer to ms, their core is a power3 powerpc base (sony and ms use power5 and power4 respectivly ). it also has the higher functions ripped out. very good chip though that has gone through many refinements
none of the chips used by these companies meets tue powerpc spec though too much ripped out, and would suck as a general cpu ... efficentcy would not work well in personal computers
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