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Ethash algorithm behaves a bit strange on my mining rig with HiveOS and 8 GTX 1060 3GB. Four MSI ARMOR cards with Sumsung memory (OC +1500 mem) have 24+ MH/s, two other cards (OC +600 mem) have 21+ MH/s and two other slow MSI cards (also OC +600 mem) have only 18+ MH/s. I tried to switch risers, PSU, PCI slots and move the cards across rigs, but with no success.

Today I did a pure experiment. I plugged one of the slow cards to a Windows 10 machine with 1000W PSU directly via PCI slot without riser, started Claymore Miner with Musicoin (that has a lower dag size than Ethereum) and got the same result as before, without OC the card had 15+ MH/s (normally it should be 19+ MH/s):

with OC +600 mem in MSI Afterburner the card had about 18+ MH/s:

with OC +900 there was 20+ MH/s, but the system worked unstable:

The screenshots of GPU-Z without OC:

with OC +900 mem:

The screenshots of nvidia-smi output:

There was the same result with these slow cards on Ubuntu, but I did not notice something like this with ZCash on Windows 10.

With PO state and OC +150 core, +600 mem there is 20+ MH/s with the stable working system:

but normally there should be 24+ MH/s I think.

There is no a strong dependency between BIOS version and the card performance:

nvidia-smi --query-gpu=gpu_name,gpu_bus_id,vbios_version --format=csv

slow cards bios versions:
2 x 86.06.3c.00.ce
1 x 86.06.59.00.55
3 x 86.06.59.00.2a

good cards bios versions:
3 x 86.06.59.00.69
2 x 86.06.59.00.55
4 x 86.06.59.00.88 (MSI ARMOR)
1 x 86.06.3c.00.44