I don't have any real evidence, but i do have a suspicion, and a mild hope, that Phenom II will function in a lot of older AM2 boards, but will show up as an unknown processor... even without a bios upgrade. More user experiences from people who've tried it will probably show up as postings online, as the weeks go by. A quick search turned up a posting by someone who has tried one in a M2A-VM board, which does not officially support Phenom 2, and in which case it worked and showed up as an unknown processor.