IIRC it doesn't have the dual PLLs and other FX features, and they also had to keep 1:1 CL compatibility (including HID registers) for Wii mode. It's possible the core design was based on FX with CL compat backported though.
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Are all three cores the same? They have different caches and only one of the cores really need to be CL compatible, no?
The cores are the same. It would be completely silly to have slight differences. Twice the validation effort. L2/bus is different, but the actual cores should be identical at the silicon level. https://marcan.st/transf/espresso_annotated.jpg …
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(Note that some of the details of that diagram are guesswork, take with a grain of salt)
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Well they do look identical to a very large extent.
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