The move from AM2 to AM2+ included a change to the HT, decoupling the HT from the core frequency, adding yet another voltage, and they also added a different version of cool and quiet.
All this meant there were a few important required bios changes to get these AM2+ chips to work on an AM2 motherboard. Many motherboard makers didn't bother updating their old AM2 boards on older EOL motherboards. (This made many people mad at AMD.)
Since the move from 65nm to 45nm basically does not include anything that the socket will "see" as being electrically different then any bios updates should be minor such as changing the CPU's id string.
END RESULT: If an older AM2 board supports the AM2+ 65nm Phenoms then 45nm chips might work on these boards.
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