Well it is all about temperatures.  I went from 384M to 387M -- noticed no temperature increase and my hash rate increased by about 4Mh/s on average.

I have really cold AC on the unit -- Output temperatures are no hotter than 59 degrees C on "Temp(Chip)."

Didn't notice an increase in HW errors -- although Chain #3 (5 HW) and #4 (22 HW) have always shown some over a 24 hour period.  Another person had similar findings in another post.

The unit is quite impressive and the fan can get pretty quiet if the airflow and temperature is right. 

I "rent" it on Nicehash when the price is at a certain level -- otherwise it defaults to a select alt coin pool where I mine a variety of alt coins.  lol