Lunga Chung: I was following the numbers in this post:
https://www.reddit.com/r/EtherMining/comments/8m3yre/guide_overclocking_and_problem_solving_for_amd_rx/ There is a section that says [special: Micron memory].
These are the settings where all cards except for the 2 cards were 32mh/s and the two cards GPU 2 and GPU 4 were 0.000:
1200mhz / 850mV
2200mhz / 850mV
PowerLimit -30
Then it hit me, I am probably not supplying enough power for these settings. So I changed PowerLimit to 0, and upped to 900mV for both CPU core and memory, still no luck. Powerlimit is still a bit of a mystery to me if someone can explain. Does it cap off the amount of power that can be sent to the card? Doesn't make much sense to me because if 850mV is specified, then wont 850mV be used regardless of power limit?
hustleman: is it common to have 2 cards out of a batch of 8 of the same cards that will not work with the same overclock settings? I believe everytime I restart the computer or adjust the overclock/settings it isn't always the same 2 cardsd that give me probably. It is different 2 cards.
I would like to come up with a game plan to safely find the best sweet spot for all 8 cards. Not sure if I should start with my working settings 1150mhz/850mV and 2050mhz/850mV and slowly increase, or if I should start with the cards max default settings and slowly decrease. In overclockNT I DISABLE all the GPU’s states except the last one (P7) where I enter the values and additionally for memory I disable all of the states except for the last one where I enter the values.
I know something is wrong when I see the two cards with 0.000, try to close Claymore and all of Windows freezes usually involving a restart. I am assuming this is normal when it comes to overclocking/undervolting if something is incorrect.
Ok, read this guide
https://mining.help/ it basic stuff, also for AMD switch to OverDriveNTool its much better for OC then MSI AB (the guide explains in details how to set it up).
Also regarding BIOS modding this guide is pretty good
Core should no go over 1180 on 850mV
Memory at least on my Micron i see no gain above 2150 (also 850mV)
entire rig should not consume more then 960W
P.S. In my experience when cards hits 00.0 it usually goes back to default clocks and almost always indicates that Core is either OC-ed to much or undervolted to much