I have 4 Radeon HD 7990.
I would like to use them to mine ERGO ( someone tells me that each of them can give me 110 Mh /s in compute mode)
My Operating system = Win 10 x64
mY Gpu Driver = Radeon Software Crimson for win 10x64
Check this out.
https://www.ergoforum.org/t/autolykos-v2-hashrates/580