Want to make mega 2560 a little bit faster. I found someone has overclocked it to 20MHz with a new resonator and with a different bootloader. Is 20MHz the highest one can go even with a higher voltage?
Search the forum before making a new thread: ATmega2560 (Arduino mega 2560) Maximum practical frequency - #5 by CrossRoads
But that does not mean that that is the fastest one can go 
Add some watercooling or liquid nitrogen and @joedodo might be able to make it run at 30MHz or 40MHz or 100MHz or ...
Why?
Didn't work out too well for this guy, but he pulled himself back together:
OP, 20MHz any more than that and the SRAM doesn't work right and AVR dude has communication issues.
Exactly, just get a different uC.
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Not so invincible
As you increase the system clock, remember that the ADC clock that is derived from the system clock has an upper limit for full resolution. You may have to change the ADC clock prescale.
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