"Memory controller revision -explanation" doesn't make sense considering K7s had a 5-letter code too. And the whole IMC-theory is just speculation as stated by s7e9h3n. Then there's this question; why would they keep on continuously revising the IMC alone since there's no problem with it in the first place?
Infact, the appearance of the 5th letter matches exactly with introduction of copper interconnects back with Thunderbird C model K7s... And tweaking the metal/silicon layers is everything for what comes to yields and frequency scaling.
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