I have been running it at 251 for a couple of weeks with no problems. Temperatures are under control with open case, frontal fans in 45º on the frontal asics, y a big fan in the top of the case, heatsinks and artic cooler grease on the vrms.
3.3 volts at spi and around 60 amp in all dies.

716 ghs with 10006 WU. At the pool 740ghs.