I have made some tests with the core voltage in order to lower HW error rate and improve overclockability. With the original BOM the voltage is less than 1.15 V.

In the Avalon users thread GandalfG has been running his boards at 395 MHz at 1.25 V. So I thought this would be an interesting test.

Power draw from the mains power:

1.2V 300 MHz => 936 W
1.2V 350 MHz => 1092 W
1.3V 300 MHz => 1056 W
1.3V 350 MHz => 1240 W

I will see if I find time to do some more experiments and get some statistics of the HW error rates at different configurations...