I ran it for 2 months at those speeds    my gear was a batch freq rated 575  over volted at 12.5 volts






looking for the highest one  




 so this is a free 575 batch 2 running at freq 631  just under 5100 errors really good.  this machine can touch .245 watts per gh at the freq of 616 with 0.0001% errors.  by far the best of all 18 or 19 s-7's I have owned