hello.

actually i have 2 Sapphire RX 580 Nitro + 8gb running (a third MSI RX 580 Gaming X 8gb is coming on monday (it's was a bargain considering prices nowadays). Just a few tips for those that read this.

Afaik 850mv on the core is just about "right" in many scenarios. both of my cards cannot stay up with that voltage for a long time. Moreover, it happens to me than whenever my internet fails, the cards hang. Why? Because the voltage offset actually afects iddle voltage so, if the card uses let's say 100 on idle, if the internet hangs, the miner stops, the cards tries to go to 300 mhz on the core, and than the offset is applied so 100 minus offset = crash.

According to my findings, my cards can run for more than 50 hours (damm temperature hang error) with 880mv on the core at 1240mhz. The memory (Hynix and Micron) at just fine at 2250mhz without any issues at all. My micron card is perfectly fine at 2250mhz on the memory at 865mv (i modded that on the bios, no issues). For the hynix, i have it at 900mv (also modded). Stock setting for that card was 1000mv.

With DCRI 10 those 2 cards are actually hashing at 32.1mh/s. Both are using like 88W on the core and 60 for the other components, so around 150W total GPU power consumption. Solo mining. it's possible to reduce power consumption by undervolting (also reducing core speed), but my excel tells me that it's better to use a bit more Watts and squeeze the best out of it, because usually more hash rate is better than too much undervolting.

Just to clarify the numbers i'm talking about. For a reduction from 880mv to 856mv on the core, in case you are worried about electricity,  you just save around 6W every hour.  also ASIC quality is important, both of them are at 75% but if you win the silicon lottery maybe you can go way down undervolting. The best thing of this, is that once you know exactly what to modify in the bios , it's easy to get what you want.

My best advice, (if the cards are going to go for mining only), is to test them with certain settings, make sure they are stable, and then put that config into the bios, so that you don't have to apply manually the settings using MSI Afterburner.