VannI connected now 3 x RX580 where GPU1 and GPU2 is with Samsung and moded Bios and GPU3 is a new one with next params:
-cclock 0,0,0 -mclock 0,0,0 -powlim 0,0,-5
Seems to be working stable, at least 15 min without crashing. I'm monitoring it, hopefully it's a solution.
When I decrease cclock or mclock (as example to 1950) on GPU3 it gives incorrect shares or the rig simply dies. =(
crairezx20 but it is an issue even with 2 x RX580 (with Hynix memory).
I do have amp meter, this is what I have:
3 x GPUs (28Mh/s, 28Mh/s, 22 Mh/s): 575-621 W
4 x GPU (28Mh/s, 28Mh/s, 22 Mh/s, 22 Mh/s): 759-782 W
This is with the default setting, without undervolting or overclocking. But two first GPUs have moded Bios.