After a few reboots I was able to flash the bad card in windows pc 

Low mhs was because of to hard intensity on dualminer

Personally I invest in ETH as a second i would choose monero or iota

One gpu keept crashing after some time so i replaced the riser and now the os crashes into these two screens.  Sorry for bad picture quality it was impossible to get a good shot at the screen.

https://ibb.co/gSUa4b
https://ibb.co/hbyrcw

From what i understand there is a watchdog error with the cpu and it is timing out for 22 sec. The second one is something about polaris 10 voltage, assuming this is the gpu since it has polaris bios. Also had other screen i didnt get picture of stating there was a voltage leak but it was not patched


All i find online is about the psu being bad or to much oc but this happens with the cards at stock too. Its only one of the cards, atleast it was before i replaced riser. Now i dont know since it goes to other screens right after the same gpu crashes, I can see its hashrate decrease and then it goes to the screens in link.

Have anyone else had this problem? 
All cards are flashed the same way and have been running same clocks for days stable

Setup
ASRock H110 Pro BTC+
4 Sapphire Radeon RX 570 8GB Nitro+
Evga 1000W psu
Cheap risers from ebay 

I might found the sinner! one of the cards in other bios mode makes the whole system crash at bootup. The other four shows this as their second bios

4 cards: 8gb · ellesmere rx 570 113-2e366du-s4l samsung · polaris10
1 card:  8gb · ellesmere rx 570 113-2e366au-x4z samsung · polaris10

Im assuming that means they are all samsung memory, but how to flash a broken bios that doesnt even alow the rig to boot? Both bios position wont boot

The other 4 are now running at your suggested bios mod and clock, seems fine for now  

Am I losing hashrate since im running ethos and not windows with amd blockchain drivers?

Oh thanks  

how do i check the memory type now? will backuping the "wrong" bios now show the cards correct memory producer?
Since all the cards main bios is now the same as the first card

Judging on what you tell me i believe 2 of my cards have samsung memory since they still work fine with this bios mod and the others to be some other brand. Shouldn't have trusted the it's the same manufacturer it has to be the same memory gut feeling  

Edit: This is bios name in ethos 8gb · ellesmere rx 570 113-2e366au-x4z samsung · polaris10

At first I used polaris bios editor and copied 1500 straps to the above ones, then i used the one click timing as suggested in a post above.
Does it matter which bios i flash on the cards? i notice some of them have the switch in the other direction, all show as same bios in dashboard

Should also mention that i backup bios from one card and then used the modified version of that on all the cards, is that bad?

So now they just crash instantly compared to original clocks. Have I messed up my cards or just my bios?

Have checked risers they are all good unless my bios messup destroyd them

I dont really see how that would help as they crash on stock speeds but i will give it a go

Reflashed all the cards with one click timing, but they are still crashing at stock speed  even tried downloading a bios, same result
Have i broken them?

That often, maybe I put some sort of minestop and minestart command into a daily batch file or something like that

Do you mean like shut them down once a month? week maby?

Thanks for fast reply's

After 16 hours runtime one of the 3 with moded bios on stock speed crashed. I have only copied 1500 straps to higher so I will try other bios mod, still think it's weird that four of them is still going with the bios mod, two at speeds of core 1340 and mem 2150

Edit: I messed up 

In my experience msi oc really well but runs hot, evga oc well and zotac tops the list of best watt, temp and oc. Im currently running only evga and zotac, Still have to find out which brand's fans go bye bye first

They call it bitcoin mining but it's really just altcoin mining and conversion to btc, that got me confused

I don't have the stock numbers but my 1070's did 150-155W overclocked and I belive my 1080ti did 160W oc
Note that these numbers are on solo eth mining
That makes a total of about 850W for all 6 cards at max, your biggest issue will be the power connectors.
I think I have the same psu on the way It has 8x8 6+2 pin connectors, you will need 3 for the 1070s and 6 for the 1080s i believe

Also remember to not connect more than two risers to one sata cable, if you can don't use them at all. Three 1070s will get hot, two rx 570 will burn down your house

Whopsi i made a bummer to

Sorry if this is wrong place. I couldn't find any gpu subforum under altcoins
Can't delete this post so hoping i mod will fix my mistake 

I have a rig of 5 rx 570 nitro+ 8Gb cards that i have bios moded with polaris editor. 2 of them are stable at a hashrate of 23.3Mh while the other 3 sometimes run on 21Mh, jumps in voltage and eventually crash to 0Mh, it can take 30min to several hours.
core 1340 mem 2150
Running them on stock clocks is 20.5Mh and seems to be working fine (going on 3rd hour)

On my nvidia rig mem clock was king gaining 5mh overclock, but on the amd rig mem clock gain only 0.5Mh while core clock gains 2.3Mh

Bios mod, lower voltages and clocks they said... leaving me confused as that only lowers my hashrate on amd cards  
my good old r9 290 4Gb did 31Mh (core +100 mem +450-500) not that long ago, my 1070's does 31Mh now.

Im using Ethos on my rigs

What in the heck am i doing wrong with these amd cards?