I changed the frequency to 656.
mine is dead today, cannot find hashboard any more, I have rebooted and reset, still not working any suggestions? My last temperature check is 75 degree on chip, shouldn't get significantly higher than it.
Did you overclock it?
From my testing, until I see someone with more information, I'm not running it higher than about 66C in a temperature controlled room which for my environment equates to about 575mhz.
I may back it down back 550mhz as they only run about 63C at that temp for me.