My immediate reaction to the original question, was a snort of 
derision and 'what a stupid question, the answers obvious'.

I then removed the 2 by 4 from my eye and upon further thought 
realised that the logic being applied ( erroneously ) could follow 
thus.

A 1 amp power supply can provide 100mA to a circuit that only requires 
100mA, so could a 50A supply (other factors notwithstanding), so from 
that logic, it could be fair to assume that other components can be 
used in that manner, after all broadly speaking a 100uF/16v cap could 
( in some circumstances ) be replaced with a 250uF/35v, so why not use 
a 200MHz  xtal to run a 40MHz Pic? 

Further confusion or query could ensue from properties of crystals 
when used to derive lower frequencies or when using a crystal via it's 
harmonic frequencies.

Colin

--
cdb, colin@btech-online.co.uk on 9/05/2010
 
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