No matter how cool I keep my D3, I cannot run without HW errors until I downclock to 519mhz or less (18.7ghz).  My chips are all running under 60c at the default 537mhz but I'm getting thousands of HW errors a day.  I tried messing with the difficulty, fan speeds, etc. Only downclocking works.  I actually get a better accepted hashrate at 18.7ghz than I did at 19.3ghz due to the elimination of the hardware errors.  Currently running the latest code as of 1/25/18.  Hopefully this helps the others who are scratching their heads about D3 HW errors.