Is it possible that dual SIA mining NOT change hashrate compared to ETH only?
Or there is something wrong with cards/drivers etc?
Gigabyte 380x.. about 20mhs a card with and without SIA..
Moreover, at some (not large) -dcri values in dual mode you can get a bit more ETH hashrate compared to ETH-only mode (because of shorter queue to memory access), though I see it on 390 cards only.
Increase -dcri and ETH hashrate will fall.