Quote from: fullzero on October 11, 2017, 12:31:22 AM

Quote from: hurvajs77 on October 09, 2017, 09:45:52 PM

Quote from: fullzero on October 09, 2017, 07:53:27 PM

Quote from: hurvajs77 on October 08, 2017, 05:56:09 PM

Unfortunately I must write, that nvOS is really unstable with 11 GPUs in my case. I'm sad... :-( In this case, each miner crash a few minutes after mining for memory segmentation fault, in 70% of startups watchdog kill mining process for maybe 20x times. In general there are many epochs without mining - when nvOS set up GPUs, or restating whole mining process. After GPUs re-allocation there are great improvement in stability. So, someone who has in one rig more that 8 cards and succesfully OCed?

I'm solving miners crashing, OC all day. My conclusion is nvOS v0019 is unstable and I can't trust it - with 11x GPUs.

It's little strange that if rig has only 8 cards, so it's stable. So, I've two rigs now, with 8 gpus, and 3 gpus. Both use nvOS and works :-) I don't understand why both rigs can have different OC settings.

On rig with 8 gpus is this:

power limit: 208W
core: +85
mem: +480
Mobo: ASRock BTC Pro+
PSU 1200W, 1700W
7x Gigabite AORUS 1080Ti Extreme Water
1x Zotac Extreme 1080Ti AMP
i5-7600K
used these risers, powered via SATA https://www.aliexpress.com/item/10pcs-TISHRIC-2018-VER008S-Molex-4PIN-15PIN-SATA-6PIN-3-in-1-PCIE-PCI-Express-Riser/32828808283.html?spm=a2g0s.9042311.0.0.szfVUP

On rig with 3 gpus is this:

power limit: 225W
core: +120
mem: +900
Mobo: ASUS Maximus Ranger IV
PSU 1700W
3x Gigabite AORUS 1080Ti Extreme Water
i7-4790K

both rigs use CPU mining too

Hash rates are for ZCash:

with 8 gpus - about 5550 Sol/s
with 3 gpus - about 2150 Sol/s

My guess is the problem is temperature related.

in 1bash you can increase the target temp:

Code:

TARGET_TEMP=80

and increase the minimal fan speed:

Code:

MINIMAL_FAN_SPEED=75

or higher depending on how hot your GPUs are tending.

IMO 1080tis should always have active cooling; also they do best when the fans are blowing into the GPUs from the front (they are rear + top ejecting (not front like you would expect))

thanks for answer Fullzero.

Ok, I'll try it. It's true that my setting are

Code:

TARGET_TEMP=62
MANUAL_FAN="NO"
MINIMAL_FAN_SPEED=30

Yes, I use extra fans blowing to radiators from the front (I've water cooled GPUs)

I post results later.

Do you think is normal lower OC with more GPUs?

IMO you can OC a single GPU system significantly higher than a multi GPU system; for example I had 1080ti FTW3s that were stable with +2000 mc 175 pl, producing 39.5 mh/s Ethash. Take another and put them on the same rig and it can only OC ~+1600 mc; this trend continues as you add more GPUs. With core intensive algos like Equihash; you have significantly less improvement when reducing the number of GPUs.

Thanks for explain. I expected that. So, smaller rigs are better for hash rate, but more expensive for mobos etc.