Hi guys. I have this RIG:
6x 580 Nitro+ 8GB Hynix
Asrock H100 Pro BTC+
Using a custom BIOS. Concrete modded my original "silent" bios with Polaris 1.6.6 with "1 click" metod. For OC and undervolt using "OverdriveNTool"

Using Adrenaline drivers.

Have 180 mh/s

1- 1200/900 y 2100/900 - ASIC 66.8% - 0 memory errors

2- 1200/900 y 2150/900 - ASIC 72.8% - 0 memory errors

3- 1200/900 y 2100/900 - ASIC 74.6% - 0 memory errors

4- 1200/900 y 2150/900 - ASIC 79.4% - 0 memory errors but today have "Hangs in OpenCL call" the other days i can tested no errors in some hours

5- 1200/900 y 2100/925 - ASIC 68.6% - 0 memory errors but today have "Hangs in OpenCL call" the other days i can tested no errors in some hours

6- 1200/900 y 2100/950 - ASIC 79.5% - 0 memory errors. This GPU always have "Hangs in OpenCL call". In few days i will recieved a new riser to try. Yesterday and today no Hangs.... I am very confused

Max time mining without errors is 10 hours... I try for 2 months config this rig, i desperate..