check the ASIC# column, there should be 60 ASIC chips on each board.

It's possible one of your boards are dead or may just need to unplug and regplug your PSU cables

I have mine set at 625 mhz with highest chip aroudn 80c and about 100 hw errors an hour.

Might bump it up a bit when I get home.

Payout is higher and it does void warranty. So it's really just the question if it's worth it or not.

Go to miner configuration and click on the advance settings tab and then chose default from the drop down menu.

You're frequency is way too high