Agreed, other things influence the performance of a computer than clock. buswidth allows more simultaneous calculations, and therefore increases the net work done. Dual cores act essentially as a tiny renderfarm on one chip, and do the same thing. It's not about the clock, men, there are more important things...
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If the Xeon takes an hour to render it, and the G4s take 3 hours each
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Just a nitpick, a one hour Xeon scene would probably take a 400MHz processor five or seven hours to do, probably more. We strive for accuracy...
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(not considering other system specs, just processor)
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dont dismiss. The discussion is about what computer will render faster, not processor. ram and graphics cards play just as important a role in this as the processor.
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In standard rendering programs (like the default scan-line renderer for 3dSmax), three of the four cores in a quad-core processor are wasted, because the renderer only uses one. I have no Idea about the standard renderers for Maya, but I wouldn't imagine they could be much different.
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Scanline does go faster with dual cores, BTW. And mental ray adds buckets for more cores. watch a dual core render in MR. you'll see TWO boxes going at it.