I received my miner yesterday. I was hoping to overclock but even at the stock 410 Im getting chip errors on the second and 3rd boards. I contacted bitmain support and their solution is to reduce to 400 and restart several times. Even if I get the chip errors they say its ok as long as its stable and no further action is needed. What a load of BS. Brand new unit, ROI is already down the crapper and it cant even run at the stock frequency.
Some HW errors are normal, but if it's visible affecting the hashrate keep bugging them until they replace the board.