Quote from: seefatlow on April 03, 2019, 02:47:55 PM

Quote from: dragonmike on April 02, 2019, 03:05:34 PM

Quote from: seefatlow on April 02, 2019, 02:28:17 PM

Quote from: pbfarmer on April 01, 2019, 09:00:08 PM

Quote from: dragonmike on April 01, 2019, 10:06:07 AM

@pbfarmer: I'm currently testing my Vegas at 1258 core (OT setting) @ 807mV and they seem to hold for now (except for two weaker cards that won't have anything less than 850mV even at low clocks).

EDIT: 807 didn't cut it. It mined as I changed it on the fly, but would not initialise at this voltage. 815 seems to work (both init and mining) - Couple of hours going, so far so good.

EDIT2: 815 held for a few hours but ended up crashing in the end. Reducing core clocks further doesn't seem to increase stability, maybe there really is a balance to be found.

Yeah, this is a tough nut to crack - esp for those couple salty cards you inevitably run into. I'm kinda figuring out that you have to tune this a bit backwards from the normal process - stability seems to be all about mem (SOC) speed + cn_config. Core speed tuning on it's own doesn't do much - cclocks only real importance seems to be in determining which cn_config you can use. This is roughly what i'm seeing:

L28+28: >= 1150mhz
L26+26: 1050mhz - 1150mhz
L22+22: 950mhz - 1050mhz (not sure about this one...)
L18+18: 850mhz - 950?mhz

The relationship isn't cleanly linear - i've seen cn_config 'holes' where for instance, in one case L26+26 is fine, L24+24 is crap, L22+22 is good again. And in other cases, I've run into tight couplings, where even reducing cn_config incrementally caused instability.

I'm tempted to just run all my vegas like i do for ethash - 850 (core-p0) / 1107 (mem-p3) / L18+18 - and then tune voltage as needed. It's straightforward (no acg, everything fixed except voltage,) low power, and i still get 18.5kh/s out of it.

EDIT: cn_config numbers are for V64 - maybe scale down by 4 for V56?

I just don't understand how you guys are able to pull off <850mV voltage at the said memclk . My one and only MSI Reference Vega64 at the very same setting is only stable above 870mV.

Post your overdriventool profile in here please.
Also, have you got your SoC clock set to 1200 or is it still at the stock 1107? That's been the culprit for many people, including me, to get this thing to work properly.

My ODNT profile here

Name=RX_Vega_64
GPU_P0=852;800;0
GPU_P1=991;800;0
GPU_P2=1084;805;0
GPU_P3=1138;805;0
GPU_P4=1150;850;0
GPU_P5=1202;850;0
GPU_P6=1212;850;0
GPU_P7=1408;870
Mem_P0=167;800;0
Mem_P1=500;800;0
Mem_P2=800;805;0
Mem_P3=1040;870

Oh....I checked my SoC clock, it at 1107. So how do I set it to 1200?

No it shouldn't be at 1200, you're all fine.
Try to set your GPU_P7 and Mem_P3 voltages at 850. Don't disable the lower states, just make sure they are set to lower clocks & voltages than the highest, for example like this:

Name=RX_Vega_64
GPU_P0=852;800
GPU_P1=991;803
GPU_P2=1084;805
GPU_P3=1138;810
GPU_P4=1150;820
GPU_P5=1202;830
GPU_P6=1212;840
GPU_P7=1408;850
Mem_P0=167;800
Mem_P1=500;805
Mem_P2=800;810
Mem_P3=1040;850