Since yesterday I am having an issue with dual ETH/SIA mining on SMOS. Dual mining stops after like 8-10 hours of rig restarted.
Power consumption reduces accordingly on the wall. SMOS shows rig is OFF but actually it is digging ETH as the wall consumption and ethminer pool shows my rig isactive and unpaid balance increases.
Before this started to happen I noticed one of my 6 GPU's hash rate fluctuates between 19.XX-27.XX. I happens within seconds and goes back up and keeps fluctuating.
I will check power connections and risers for this GPU by replacing it with another GPU to see whether it works fine on other riser and other GPU works fine on this riser.
Possible reasons:Insufficient power--> Have dual Evga 850 G2 on add2psu. So power should be enough.
PS1--> Powers 3 GPU (2 on risers and 1 on mobo) and system. PS2--> Powers 3 risers and 3 GPUs on them.
I wanted to avoid SATA-molex adapters so shared GPU/riser pairs on PSUs.
Power connections--> I plugged one GPU on mobo, 4 GPU on PCIE 6 Pin powered risers and 1 GPU on 4 Pin Molex powered riser. Do not even use SATA-molex adapter.
BIOS Mod--> I will decide this after I switch GPUs on risers. If thrashing GPU keeps lowering hash on other riser then BIOS/Volt settings of this GPU might have an issue.
Temprature--> Thrashing GPU is in between two other GPU's. The one in front it has better air flow but but the one behind the middle GPU works fine so far. Although it is breathing hot air from middle one.
Pool--> Using SIAmining. It was fine for a couple of days since I started dual mining. Now it rejects my rig?
SMOS--> Rig is digging ETH now but SMOS says my rig is OFF?
Edit_1: I switched GPU 2 (the one losing hash ) with GPU_1. Now both works fine but now GPU_3 started to fluctuate on hash values
And GPU_3 has better space then other cards. It does not look like a riser problem.
Will make another switch to track the problem.
Any ideas?
Edit_2: I managed to specify ne gpu with bios modding problem. Cut its undervolting and gave little bit more mV.
Now system looks ans runs fine.