When trying 1000 MHz, the BeagleBone Black locks up and isn't responsive either on the network or via serial.What power source? I have a 4A (2500ma) 5V supply.
My power supply is a 3 amp unit with a nice, thick cable. I'll try a different one and see if it makes a difference.
At 550 MHz, the voltage measured off the power connector is 5.11 volts. At 900 MHz with the CPU at 100%, it's 5.11 volts. With the other power supply, it's 5.13 volts.
Maybe my BBB is broken - it won't go to 1000 MHz and it's already reporting bad sectors in the built-in flash. Sigh.
John