CoreClock Fluctuating RX580 (MH/S changing...)

[RapBTC1]

hello everyone..

I have a problem (It's a strange problem wtf...) my rig working since 1 month and now i see,
2 of my GPU (I have 8 GPU) the hashrate has loss 5 mh/s (30mh/s to 25mh/s)
i check why. And i see its the coreclock fluctuating everytime. (Coreclock : 1150)  
Fluctuating exemple ( 800-850-790-1100-1000-900-1060 etc..)
6 GPU working perfect, without fluctuating and "THIS" GPU change everytime... and the mh/s follow him..

Image :



Do you have an idea please ?

Thanks

[nitrobg]

Undervolt your card to 900mV or lower and it will stop throttling. Your GPUs are waaaaaaay too hot.

[RapBTC1]

i have undervolt , but i dont know why its so hot xD

[nitrobg]

Your undervolt doesn't stick then. It can't realistically reach 74C and 70% fan if you are solo mining.
Use OverdriveNTool, set core voltage = memory voltage and disable all but the last P-states.

[RapBTC1]

Okay but look , its okay my voltage and my memory voltage i dont understand :

[mayers8851]

Your cards are throttling, try to cool them more and confirm it, at least set fans to 100%.

[Golempl]

Check if your GPU voltage decreases to 840mv , because some GPU have one voltage regulator so mem/gpu voltage need stay in same range or higher value will be applied to both mem and core

[nitrobg]

Okay but look , its okay my voltage and my memory voltage i dont understand :

Disable all except P7 on core and P3 on memory. Set both core and memory voltage to 840. Save it as a profile, reset the settings, load it back and reapply it.
Your cards are VERY hot, you shouldn't treat them that way if you want them to last more than few months.

[RYXES]

Not sure on you GPUs but if its AMD, get the Blockchain Beta driver and undervolt in Claymore Scrypt and use MSI Afterburner.

That should give you consistency.