wbmw: comparing these two images, I see more similarities than differences.
Zoom in a bit. The macrostructures all seem remarkably similar - until you start to look at the "fine print". Contrast these differences to the differences between the various Athlon cores
The "250nm photo" is a bit rough - and it's where you'll find the most differences (since prefetching, SSE, improved BPU were added) - but even here the similarities are much more striking than with the Opteron.
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