I really wish Bitmain would make a post about Batch 4 and the reported issues we've had with the first three batches.

Not sure if I should take the refund or coupon. Performance is less than 7.7% difference on some units, it appears ~33.33% (3 repeating, of course...) of the units exhibit performance below the stated 441GH/s, and the random beeping... OH THE BEEPING... WHY GOD, WHY !?!???