>>
One thing that must be concidered is that any error that the Resonator or
crystal has will also be multiplied by 4.   This could effect high speed
serial IO.  As I dig further into this I will post my results.
<<

In absolute terms, yes, but that is not relevant.  A 10MHz crystal with
100Hz error will generate a 40MHz clock with 400Hz error.  But the
percentage error is still the same, which is all that matters for things
like serial I/O - whether high speed or not.


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