What I guess may be the first hashboard has a bad heatsink bad adhesive or solder on that chip same on the 3rd hashboard. However, would you mind try replacing the PSU I see weird under Vo it shows 0 so it might be your PSU giving a false signal?

Did you start ethdcrminer64.exe with admin privileges for the first time to install the driver? If your bioses are modded you can see no difference with strap mode but you should see the difference with rxboost option

Any idea regarding this? Thanks

Actually, all these settings will increase or decrease the mining intensity, but in different ways depending on how you want to use them.


-dcri  Used for individual tuning of each GPU for maximum hash rate.
         It will definitely increase or decrease your hash rate depending on how well it is tuned.
         If it is tuned badly then the intensity is actually lower and you will get less hash rate
         but lower temp on that GPU. Tuned well and the hash rate goes up and also the temp. You want this
         tuned to the highest hash rate on each card.

-ethi  Used to set the Max intensity per card. If you set this to the max allowed your cards
         will mine to the maximum intensity allowed by the miner. However, if you have badly
         tuned the -dcri then that card will still not be getting you the maximum intensity.
         Also, the -li if used will lower the intensity if you have it set. And of course  the -ttli will
         also cause the card to use a lower intensity if the temp you have specified is reached.
      
-li      Used if you’re having a heat problem with a card. It basically decreases the
         intensity of the GPU therefore lowering the heat.

-ttli    Automatically decreases the intensity for a card if the temp you specify is exceeded, that lowers the temp of that card.


Here is the way I think these setting should be used. It is how I do them and I have no issues.
If anyone else has a better or different method I would like to know what it is please.

1st:
-ethi
Set this to maximum value to get the most mining intensity and the highest hash rates.

2nd:
-dcri
Tune your cards to get the maximum hash rate on each card. Each card will probably have a different setting.

3rd:
-ttli
I set this to a temp that I don't want my cards to go above at any time.
I set mine to 75. I don't want any of my cards to go above 75. If for some reason they do
then the miner will automatically reduce the intensity on that card and lower the temp for me.
If this happens you can see it in the logs. Then you can set the -li for that card only to lower
it's intensity so that it doesn't happen again.

4th:
-li
I would only use this to reduce the intensity on a card that was giving me a temp issue
that the other settings did not handle.

If all your cards have slightly high temps after doing this, then the best thing to do is
use the -ethi and lower that number for all the cards. All cards will then mine at a lower intensity
and the temp will be dropped on them all.

These are my opinions and experience of how these setting work.


Edit: Note

All this assumes that you have not overclocked to a point where increasing the intensity will cause you a stability issue.