Antminer S7 Batch 8 at Frequency 600 is 4,047 MH/s
But I suggest to use miners from Batch1-5 or Batch7 at lower frequency.
good point my info was for a batch 1 and batch 2 miner.
screen shot is below is my batch 1 miner
fan at 30%
freq at 506
hash at 4175
temps are good
pretty quiet
lastly 0 hw's as in perfect.