Some guys are just mean here.. I know i'm a noob on this forums but cmon we gotta help each other out.. I asked if I should mod my bios and not one person answered me. Anyways I went ahead and did it glad I did and don't know why it took me a year lol.. most cards get me around 29-30 even one card does 31mhs... Now one set of cards gets to 31mhs but with tons of errors.. so i lowered clocks. overnight each card got around 30 errors is this bad? If I clock those cards lower I get MHS lowered then before modded.. Should I try another bios on those? Also if somebody could point me to a good modded vbios repository would be awesome thanks.
For my rig I am having a couple thousand errors in a day. I have 6 Sapphire Nitro+ RX580 total hash 185 Mh for solo mining with 800Watt from wall. System never crashes up to 48 hours. I always restarted system before that time, maybe it could run even further. So i think you can overclock your card a little bit further. Use HWinfo64, overclock each card seperately and if there are no huge number of error in couple minutes you can use that values safely.
To complicate matters, it all depends on the type of RAM your cards have too, which is luck of the draw when you buy them.
You'll get Hynix (best) 30-31Mh/s, Samsung (ok) 28-29Mh/s, or Micron (sucks) 28-29 Mh/s.
My rig has five Sapphire Nitro+ RX480's and one Sapphire Nitro+ RX580 (to replace a dead RX480)
The RX480's have Samsung ram. The RX580 has shitty Micron ram.
You can, with some vendors cards but not all, flash a RX480 with a RX580 bios and get a slight (< 1 Mh/s) performance enhancement.
I did this to simplify driver installation, all cards appear the same to Windows 10 and all use the same patched driver etc...
I've got two custom BIOS images that I use, both derived from the stock 580 BIOS, but one has timings for Samsung RAM and the other Micron RAM.
I'm running at about ~ 175Mh/s, 800W. (Not currently dual mining, not worth the extra 200W heat and wear/tear on the cards.)
(There's the occasional dip to ~ 165Mh/s which I'm currently troubleshooting but may be clock, voltage or fan related.)
Stale shares from the pool are always less than %5.
I get no reject shares, no claymore GPU errors, and VERY FEW HWinFO64 errors. (Most cards are 0, one is 10 to 20, and one gets about 40 a day.)