Afaik the new USB pic18F's are guaranteed up to 48MHz.

Bob Blick wrote:
>> Does anybody have experiences to share about overclocking
>> 40MHz-rated PIC18F parts to about 44.5MHz?
>> I need the PIC to be perfectly in sync with some peripherals
>> which must run at an integer fraction of the mentioned MHz.
>> 
>> Is there an ~official test somewhere to test the core for
>> reliability? (e.g. there are lotsa x86 utilities of this kind)
>> 
>> What is the best voltage to achieve most stable overclocking?
>> My guess is 5.5V but maybe I'm applying too much x86 physics
>> here.
> 
> You'll have to write your own tests, I'm afraid.
> 
> Connectix made thousands of Quickcams with 20MHz PICs overclocked to
> 24MHz, so don't let anyone tell you it is something serious people would
> never do.
> 
> You might want to test PLL oscillator, eeprom read and write, and A/D
> first, those would be the things I would guess to be the biggest problem.
> 
> Test at different temperatures, compare startup times, etc.
> 
> Then make a web page with your results!
> 
> Cheerful regards,
> 
> Bob
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