Hi - I have an XFX r9 390 running a stock/standard BIOS, running directly on an ASUS MB running the latest HiveOS. While the card is mining ETH using Phoenix, I’ve noticed it seems that almost none of the OC settings applied in the HiveOS GUI actually changes much on the miner platform itself. Meaning I can try changing GPU and Memory frequencies, but it has little to no effect.
The only thing that does seem to work is changing the Core State to a lower value (e.g. 4) that seems to undervolt the GPU. But even that is very finicky as the GPU seems to fall back into full power mode after some amount of time - 24 hours or so, sometimes triggered by something as simple as turning the monitor on.
I generally get 29.5 MHs @ 175W when it’s running full bore. 25.8MHs @ 125W when undervolted by core state = 4. I can’t seem to get any of the GPU or Memory OC setting to apply.
Is this expected? Or would it be resolved if I flashed the VBIOS? Or is the OC just limited support given the age of these r9 cards?