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Have now got up to 225MHz giving 12.375GH/s using a setting of "2:225:0882"
This as high as you can go with the Core voltage at it's standard setting of 0.61V. Actually this is better than I expected as the data sheet calls for about 0.67V. At this point I am seeing a few too many HW errors and at 250MHz there are a lot of errors. I will fit a pot Tomorrow, adjust the voltage up a little and push on up.
This is BTW with an external 5V PSU as I suspect the built in one would have run out of steam by now?
Rich