My last board was running with 350MH, default is near 500MH. Unfortunately I lost the last bloody board last week.
Underclock is not the answer, how could undervolt this boards?

Hi

This is my first question, please be patient with me.

I have two D3 ( December patch - 19.3 GH) for about 4 months, The miners was working good for about a month and I get a lot of HW errors and ASIC # lower than 60, and finally one board disappeared from status page. This story happens for 3 of boards and 2 of them only had lower than 60 ASIC chip.
I shipped 5 hash boards back to china for repair.
I have pretty stable voltage and the maximum chip temperature was below 85 degree.

What I did wrong? If there is a problem with this patch or I must run miners in a very cold temperature or something I didn't know?

Regards,
Soroosh