Hmm, I've been playing around with version 9.4.
Should my GPU (RX570 4GB) have poor ETH hashrate (19-22) and get better as I undervolt? That seems backwards. Normally you have to jack powerlimit or give +vcore to stabilize clockspeed under utilization. Is this expected behavior?
At stock, 1.00v vcore and 1246mhz core, 2000mhz mem @ 1500 straps: 24MH
At undervolted / underclocked, 0.806 vcore, 1100mhz core, 2000mhz mem @ 1500 straps: 29MH.
I've played around with the powerlimit settings, different undervolts at different pstates. I can't quite see the pattern as to why this miner performs better the more I reduce power.
Does anyone have an idea?
I hear the RX5xx series is a lot like the RX480.
You can even put a 580 bios on a 480 if you dare. thread on techpowerup
So... you could try to emulate what the Jukebox v4 RX480 bios does and make your own 570 version.
That is:
1. Increase Max Power Limit by 5W
2. Set 1150mhz core clock.
3. 2150 MhZ memory clock @ 900mV, 1750 straps to 2000.
4. WattTool to drop voltage -100mV ("-16" in the gui.)
If that is unstable, drop memory clock to 2130 MhZ and try again.
What's probably happening when you undervolt is that the card runs cooler and makes less errors resulting in faster reported rate.
1500 straps are probably unstable @2150mhz as they are on the RX480. YMMV. You may have a shitty card.
I appreciate the insight, things are a bit clearer now.
whats the fastest eth hash most people get on a 470/570? the 480/580 is a bit different, can push the mem faster and has more CUs. I've seen about 31MH/s for the 480/580 around the top. I've got my 570's all dual mining ETH+DCR at 29MH / 667MH @ 125w stable. At this point I think I can only squeeze a few more watts by keeping the power limit and undervolt ratio the same, but the lower I go with the undervolt the more stability problems. I'll stress test 0.8250v overnight.