Re: AMD Mem Tweak - Read/modify mem timings on the fly

I have now run ~72 hours w/o any issues with 24 Vega64 GPUs(good and bad ones) mixed in 4 separate rigs ... CNR with core 1407Mhz /860-970mV , Mem 1080-1100Mhz/860-970mV.

I would say this is pretty stable setup. Pool side 24h avg hashrate fluctuates in the range 54,1-54,4 kH/s

--CL 19 --RAS 28 --RCDRD 12 --RCDWR 5 --RC 44 --RP 12 --RRDS 3 --RRDL 3 --REF 15600 --RFC 250

I am happy and have in my mind... "dont touch when things go smoothly".

Thats an insane voltage range, and I cant fathom how 970mv could possibly be necessary. Between 9 64s and a flashed 56, I run avg 834mv, none over 850, for similar clocks/timings. That puts me @ 178w per GPU at the wall.

At 970, youre running at least 35% higher power, meaning over 240w per card.

It sounds like you have some ppt issues or something, maybe youre running your SOC @ 1200mhz unnecessarily (it should be 1107 @ your clocks.) Although, even then, you prob shouldnt need much more than 925mv.

Oops... I made a quick check with HWtool and yes... I really have SOC max @ 1199Mhz. I have used the Hellae 920mV PPT and then adjusted with Overdrive Ntool the Core P7 and Mem P3. I havent touch the SOC. After memory timings my rigs are pulling like 1420-1500w from the wall per rig. My rigs run like 150w w/o GPUs and after OverdriveNtool the wattage is ~250w before the miner starts and all the GPU led lights are fully on.
This sounds to me like 1270 to 1350w with 6 GPU and on avg. like 210 - 225w/GPU. :O

Thanks for pointing out the SOC. I need to drop to 1107.

When I tried to scribble down a new Vega tuning guide to include in the TRM 0.4.4 release, I was debating if I should have mentioned this or not. I opted not to, that text was long enough already anyway.

However, I know more than a few skilled and knowledgeable Vega tuners that ALL have been stuck with old PPTs from the fall of 2017 (brnsted, Hellae) that for some reason all have 1200 for SoC. At the time, I guess it was considered highly beneficial for stability. Fast forward a few years to times where you don't make $10/day/Vega and power draw is a crucial part of your setup, this trade-off no longer holds.

In the common Google sheet (https://docs.google.com/spreadsheets/d/1-rhYsaRXO1ahk3PyrEgT9gXzs7ImAzh-sbqtgwy8HQg) used for PPT tweaking you can edit the SOC clk value but guess what: it doesn't change any nrs in the PPT, the cells aren't connected(!!!). You have to change the SOC clk value in cell AE26, then manually copy cells AG-AI:26 to T-V:11. You can probably guess why I may sound a little pissed off Grin

Yeah.... I fixed my file so that these cell are now connected. Will test today what kind of mV I can get with 1107Mhz SOC.

please post the PPT for reduced SOC.Thanks in advance.

My initial findings.... so far stable rig with no hash rate drop(tested only one so far).
Power draw from the wall dropped ~200w Shocked

(1450w -> 1250w). So if my rig w/o GPUs pull like 150w it means that 6xVega64 are now pulling like 1100w or ~185w/GPU.

GPU_P0=852;860;0
GPU_P1=991;860;0
GPU_P2=1084;860;0
GPU_P3=1138;860;0
GPU_P4=1150;860;0
GPU_P5=1202;860;0
GPU_P6=1212;860;0
GPU_P7=1408;860
Mem_P0=167;860;0
Mem_P1=500;860;0
Mem_P2=800;860;0
Mem_P3=1100;860
Mem_TimingLevel=0
Fan_Min=3200
Fan_Max=3500
Fan_Target=75
Fan_Acoustic=2400
Power_Temp=85
Power_Target=-20
Fan_P0=24;11
Fan_P1=40;40
Fan_P2=48;60
Fan_P3=54;70
Fan_P4=60;85
Fan_ZeroRPM=0

Haven't yet tested to go lower....