I said: > Disclaimer: if you put silly numbers in arm_freq, bad stuff > might happen. Supposedly the firmware detects this and sets > an irreversible bit somewhere that voids your warranty.
There are claims in the raspberry pi forums that the 'void warranty' bit will be set if you configure force_turbo=1, whatever the frequency. So if you care about this, you may be stuck at 600Mhz unless someone cares enough to reverse engineer the linux speed management code.