Topic: R9 Nano Modded Rom - page 14. (Read 60873 times)

Using CDM v4.5, ethpool.org and for both rigs below, 0% invalids. Powered risers and molex. '

H81-BTC/Celeron1840/W81/8GB RAM/120GB SSD/EVGA1600/USB3 Powered risers.

MSI R9-390: -100mV, 1050mhz, 1125mhz, 30MHs per card, 5 x 390 = 150MHs, temps=75-76c

Sapphire Nano: -150mV rom mod, 1040mhz, 300mhz, 29-30MHs, 6 x Nano = 177.8MHs, temps=74-75c

from my study of the H81-BTC boards - these are originally for LTC, BTC era and those ribbons PCI connectors draws as much as additional 75w per card. You will have no issues using unpowered risers for older cards (or the power efficient Nano). The short circuit issues happens when power hungry cards like 390/390x that draws as much as 270w per card - without powered molex or powered risers, GPU overdraw too much from board which is only able to handle 70w per card. See that post about "H81 BTC Beware".... IMHO, no fault of H81-BTC, you need the molex powered as instructed by ASrock. What makes it worse is that ribbon cable quality is very low, and if used for newer power hungry cards - surely spell overheat and fire hazard. The powered connector is soldered manually and taped around with duct tape. The USB3 powered risers are much better 390s.

For my case, my 5 x 390s draws 13XXwatts from my EVGA 1600w, and that is undervolted, and overclocked - I couldn't get to 6 cards because it will exceed 1600watts. I can downclock it to about 26MHs to keep it under 1600w - in this condition, molex and powered risers is a must to give the cards enough power.

What miner are you using? I've tried every miner and I use claymore dual miner now (1.4 is best). It works the best for me. I get 0 invalid shares on 5 390x sapphires, 6 380 strix, and 5 XFX Nanos. Using windows 8.1.

My hashrates and settings are

5-390x
30Mh/s per card 1110mhz/1501mhz -37Mv 0% power. I am using 1450 watts and mining at 152Mh/s average. They can go as high as 33Mh from what ive tested. I will get invalids going that high.

5-Nanos
Im using the -75mV VDDC, -100mV MVDDC Rom
Claymore Dual miner, ive been able to run Decred on it and be stable too with decred intensity 15. This adds 80 watts and 4C to temps.

+96Mv/100% power
975Mhz/300Mhz

Getting 28.5Mh per card on miner, 140Mh average on pool ethermine:14444. Im using 900 watts.

My 380s dont get invalids either.

Asdalani, i flashed bios with the one a few posts above. This has allowed me to run at 975Mv so 28 Mh/s per card. Ill try Trixx on the Nanos, when i used it before on 390s I couldn't find a way to change settings across all cards at once. Is there a way to link similar cards like AB?

Eliovp, Sorry man   I am happy with this ! But still want to figure out why its crashing before 1000. I know its something i'm not seeing, I appreciate the help! Ive read this whole thread like 5 or 6 times  

Citronik, I thought about adding the Mobo molex connectors, but everywhere I read said not to with powered risers. Some people said they were melting cables I will try it with one and both connectors today. I figured Nanos didn't draw enough to need them. My 5 390x sapphires don't have them plugged in and they overclock normally if I try it. I undervolt them as much as possible tho. I'll try and learn more about it.

Also I was running 16.1.1 drivers and when it crashed I would have to F8->safemode->DDU-> reinstall drivers - Or I just got a black screen after windows. When I switched to 16.4.2 I haven't had this issue after crashing. Maybe this will save you some time.

I think the black screen was from afterburner. When it crashed (atiksysdag or machine_check) it would try and keep my high clock settings, but set the voltage and power% back to 0. So the cards would insta-crash. In safe mode I delete the afterburner profiles from folder. Then I can reboot without DDU.

I mine with the ethpool.org. I noticed that my 6x nano has more stable shares (6-10%) than the 6x390 (1-3%). Anybody has similar experience?

Hi Eliovp, i got this one working now at 1020 core.
I can reduce the core volt by another 24mv in afterburner

I still run some tests, but this seems okay. Any chance you can do a -100 core/-75mhz for me?

Also in case of not too much work, would be great to have 6mv steps from -100 down to -75. in this case i could try to find the sweet spot.

Thanks so much,
Talan

UPDATE:
1. Looks like -200mV is not for me.... after flashing, power off, DDU etc.... installation of of Catalyst 15.12 or latest 16.x.x hung halfway at 12%. Rebooted cold or reset, blank screen.
2. well.... the -175mV rom did not go well too.... after reflashing, DDU, install of Catalyst latest drivers... Launching CDM goes silent after identifying the Nanos. Tried qtminer, also no luck.
3. Decided that -150mV is probably best mod for now until Heliox gives a few more ideas on how to fix issues above.

I did a 100% increase from the opensource in the quark algo 1 year ago, but the russian bins are +600% so I need to study more.

Using -150mV rom mod on Sapphire R9 Nano
Results: Clocks:800core/300mem, 657watts, 2.67Amps, 132.5 MHs, temps=59-61c, fans=19% (mining ETH mode, CDM 4.5)
Current system: Win8.1, Cat-16.5.3, ASrock H81-BTC, 1840 Celeron, 8GB RAM, 120Gb SSD, USB3 Powered Risers, EVGA1600

Notes:
1. Big saving$ on PSU - now can replace it with smaller PSU.
2. Cranking up to core clock to 1040mhz/300Mhz memclock, gets to about 176MHs but wattage and amps will increase too 1348w and 5.4amps. Temps will also rise to 76-77c and fans 49%

Next project 2nd attempt on -175mV rom mod.
It worked well on 1 x Nano (see my previous post)
When I got all 6 on same rom mod, I had issues bringing up safe mode to apply DDU. I may have given up too soon. Will try and get this going after I see how stable the -150mV rom mod runs after a few hours mining ETH only with latest CDM 4.5

I thought you only work on Nvidia

Alot of cycles is wasted on waiting on the memory to the  finnish to do the random access.

Well, no one is stopping you

My next stop, shedding those rops..  "although that it seems to be a difficult job, if not impossible.." time will tell.

Keep me informed about your progress

Greetings!

The bios is perfect. But the kernal is suboptimal...
I picked up 13 r9 nanos and I think I can boost them on low clocks..

Oh, looky here, sp in my thread Welcome!

The code is shit? I hope you mean dagger? What do you mean by the competition is reducing the power/cost in the programming?

I could have kept this for myself, i would have (probably) be one of the few that was mining at a very decent hash rate at a rather low power usage.. (especially with nano's...)

But oh well, i'm still a "You give some and you get some" person..


Edit, i see you edited your post.. "the programming of the kernel code"

Keep modding. The code is shit. The competition is reducing the power/cost from the programming of the kernal code...

Just an extra here

In case of stability.

Almost all my rigs have been stable for over 40 days non stop.



As you can see, 970 hrs, over 110k shares

This is with the -100mV VDDC, -175mV MVDDC rom.

Picture of temperatures.



So far, amazing investment!

Greetings!

Mrmaroon, you should check out other things for your issue mate, like i said several times, 100 nano's here, not one with any issues like that..

Asdalani, For a 390 yes, not for Fiji, +75 max, AB does +100max (or minus..)

You have to use the Sapphire Trixx. It allow 200mV higher or lower.  I used it for my R9 390 rigs.

The H81 BTC was helpful because of the on board molex power. I didn't need any additional mV to hit 29.xx MHs - does this makes sense?