I don't want to run a 4MHz chip at 20MHz. But if I bought 4MHz chips
    that are actually 20MHz chips I would like to KNOW. :o)

I think it's unlikely that chips that have actually been through the testing
procedure for 20MHz parts would be (re)marked as 4MHz parts.  What IS likely
is that long after a production line / die-shrunk design is producing chips
that will ALL run at 20MHz, only some of them will go through the testing
regime, and the rest will get labeled as 4MHz...

BillW

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