Doug, I was talking about the block diagrams. It seems rather odd for an engineer to explain that they ripped everything out, started from scratch, and later ended up close to where they started. In some cases, I can see how they would want to redo things from scratch - routing and gating are two examples. The same was done for Banias. In terms of actual logic, I can't imagine what they did differently. Athlon already had a fairly optimized backend. The quote that you linked seems to suggest a lot of rework for nothing, and I don't buy it.
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