Yes very nice, that's more like the sort of Overclock that we should be seeing.

Technically according to the BM1385 Data Sheet with 12.8V you should be able to run 775MHz giving 6278GH/s

Although I would want the fans running flat out for that...
Rich
Yes I tried to go higher with frequency(and fans accordingly to stay ~ 70C) but it would give higher HW errors and lower hashrate so...
I guess there are some losses trough the chains and the chips don't get the full voltage.