Just leaving feedback here on the version 10.0

Using 5x RX580 and the amd blockchain driver from 23rd august, it's now possible to parcially control the voltage.

I had my voltage set at 0.875v but the driver ignores and it sets 0.912 as the minimum. If I set 0.800, it still selects 0.912v.
So this means that I have an increase in power consuption. My 5 gpu rig now uses 120w more power.

So, if you have this 0.912v limit as I have, don't use a low core clock because with 0.912 you can do near 1300mhz stable (rx 580 sapphire pulse)
With that extra core speed, make sure that you increase the DCRI value so that the second coin uses the full extra MHz for maximum efficiency.

Before: ETH 144MHs DCR 4700MHs (at 1200mhz 0.875v) +/- 840w
Now:    ETH 150MHs DCR 5750MHs (at 1300mhz 0.912v) +/- 960w

Because I pay 0.17€/kW, it's almost not worth the extra speed vs power consuption.

Please reply if you also can't set the voltage any lower than 0.9v