Quote from: pbfarmer on December 27, 2018, 11:08:20 PM

Quote from: nordmann666 on December 22, 2018, 02:57:36 PM

Quote from: pbfarmer on December 20, 2018, 10:04:21 PM

Quote from: GordoLui on December 19, 2018, 11:47:49 PM

Just a small update on how my small farm is doing, I been running this miner for a week now pretty stable with almost no issues. Not sure how I can check for the percentage of rejected and accepted shares, but all the numbers seem to have evened out. All my miners have been running almost all the same across the board. Maybe a few points of difference between them but they can all hit at least 1900 sol/s for my vega 56's.

A few days ago I read a reddit post of a dude saying he was able to hit 2000 sol/s on his vega 56 with an extremely reduced power draw. He was using the recently released adrenalin drivers but didn't give out much more information. So far I have downloaded the second to latest drivers and have been able to closely replicate the results i had with using the soft powerplay table mod and using overdriveN tool. It does feel like there is room for fine tuning but i wouldn't know where to start. Ideally I would like to hit the 2000 sol/s using 115w on gpu-z. Maybe not that low but having a system total power draw of 500w or under for 3 vega 56 would be very nice.

Haha - "sol/s"... someone's been mining ZEC? Wink

I have mostly 64s, but my one 56 is running around 1950 H/s at sub-160W ATW. It doesn't seem to be the best asic quality, and is a bit old, so I would expect better from a larger sample set. I also flashed to 64 rom a while ago, which is useless for CNv2 (unless you don't care about power use,) so even lower power use should be expected on a stock rom given that 56 mem runs at a lower voltage, while it's tighter mem timings allow similar results at lower clocks.

For 2K H/s (and best efficiency,) I would suggest a voltage setting of around 840mv (or less if you can get away w/ it,) while targeting a 1400 effective core clock. I say effective, because the low voltage will almost certainly cause significant core clock throttling, so you will likely have to set your P7 clock much higher than 1400 to get to that level while under a mining load. For example, I run a 1450 @ 835mv P7 setting, and only get a ~1360 effective clock out of it. On some of my 64s, my clock setting ranges from 1430-1500 (@ 815-850mv) to get to ~1400 effective. As for mem clock, I believe you're looking for a ~950Mhz setting for a 56 - higher is obviously better, if possible.

Regarding the PPT, it really is only necessary for two reasons. The first is to lower your P0-5 power state voltages to allow undervolting P6/7 appropriately. This is necessary via PPT, because P0-5 can't be set w/ ODNT/Wattman/etc, but power state voltage settings must be in ascending order. In other words, w/o PPT, the floor for P6/7 voltage is whatever the stock P5 voltage is set to - around 1.1v iirc. With that in mind, I set my P0-P5 @ 800-805mv via PPT, then tune P7 (while miner is running) as appropriate via ODNT. 1450 @ 840mv is prob a good P7 starting point while tuning.

The second purpose of PPT is to lock in your final settings once you're done tuning, as it seems the drivers don't seem to always honor the ODNT voltage settings on load, but if those same settings are written to PPT, they 'stick'. This also technically removes the need for loading ODNT profiles at startup, though it doesn't hurt anything to continue to do so.

So in short, your steps are:

1. Create a first PPT simply to drop your voltage floor
2. Tune while miner is running to get to an appropriate/stable P7
3. Recreate PPT using final P6/7 values

A couple other notes:

- a cn_config setting (for trm) of 15+15 seems to be better than 16+14, at least for these lower clocks

- CNv2, esp w/ the TRM rocketship, is an unstable beast power wise. Settings which may seem stable at first (even for hours,) may lead to a crash at some point due to power starvation. Even once you think you've found the correct settings, expect to have to dial voltages up (or clocks down) by increments of 5-10 over time to get to a truly stable setup.

- You can create PPTs via ODNT, by running in admin mode, then clicking on the GPU icon (top left) and selecting 'PPTable Editor'.

- As a starting point, here is my ODNT profile for my 56, though every card, properly tuned, will have different P7 values (also note my mem clock setting is for a 64 bios):

Code:

[Profile_66]
Name=cn8-srvega56-s-r1-2
GPU_P0=852;800
GPU_P1=991;801
GPU_P2=1084;802
GPU_P3=1100;803
GPU_P4=1125;804
GPU_P5=1150;805
GPU_P6=1350;815
GPU_P7=1450;835
Mem_P0=167;800
Mem_P1=500;800
Mem_P2=800;802
Mem_P3=1107;830
Fan_Min=300
Fan_Max=4000
Fan_Target=50
Fan_Acoustic=0
Power_Temp=80
Power_Target=0

EDIT: I always run latest drivers - never had a problem w/ them other than when using stak/derivatives (TRM is an entirely separate codebase, so doesn't suffer from the same issues.) It should be noted that the latest Adrenaline drivers allow setting P0-5 now, which should remove the need for PPT. Sadly, based on my testing it would seem they forgot to extend this capability to the mem power states, which also act as voltage floors to the core.

how you manage to get mem P3 other value than P4 Core? i tried to set mem P3 at 830 but than Core P4 will set also to 830.

and are all my cards shit that i cant reach stable 1450Mhz also with 850mV (only 1430 is stable)

my main goal is saving energy (to put another Vega into my rig with 1500W PSU)

mem P3 will always be set to P4 core in PPT. You can override this in ODNT w/ a profile later *if necessary*, though it shouldn't really ever be necessary. 'Mem voltage' in PPT and profiling tools (ODNT, wattman, etc) is simply a floor for core (and soc) voltage. If it's set below your core voltage, it's pretty much inconsequential (though I'm not certain if it also sets a floor for AVFS feature, so a reasonable number may still be desireable.) On the other hand, if your Mem P3 voltage setting is above your core P7, then you will run core at that voltage instead. Your actual mem voltage is fixed in the BIOS.

regarding stability - are you trying to get to effective 1450 @ 850, or your setting is 1450? If it's the former, that's likely just not possible. If it's the latter, i wouldn't focus so much on the setting, but rather look at the effective. I have some cards that drop 100Mhz under load (and therefore need to be set ~1500,) while others only drop only 25Mhz (and can be set closer to your 1430 number.)

so if i understand you...after i have to set P7 Core to 860 (everything lower will result in instant crash or core speed 850MHz) i can also set Mem P3 to 860 cause it will not affect the power consumption?
and i tried P7 1400 with 830,840,850mv but nothing to get stable - after 860mv i can push P7 until 1460-1480 (effective 1375-1395 depends on card)

it´s most important for me to reach stable hs around 1900-1950 with lowest possible power consumption. with getting back to vega 56 bios i save 10W/card - thats good..but the cards need 160-170W - to much