Unstable MH/s on one GTX 1070

[h2gvaka]

Hey guys,

I'm running 6xGTX1070 ring. 5 cards are working flawlessly but first one in array is unstable(even on stock clocks). Her Mh/s and power consumption are fluctuating a lot. On stock clocks MH/s are falling from 25 to 15 or even 12 parallel with power consumption from ~125w to 80 or even 50w. What could be the issue? I'm using 1050w Cougar GX PSU. Could that be an issue? Though I saw people running 8 of these cards on 1300w PSU flawlessly.

[1715356744]

1715356744

[1715356744]

1715356744

[1715356744]

1715356744

[1715356744]

1715356744

[iamnewhere]

As your PSU is not that good it would limit first the power limit in Afterburner (50% for a first test, later you can go maybe to 60%), the memory clock you can push by +300 or +400, the core clock leave untouched or even lower it by -100 (i guess you mine ETH and this uses mainly the memory).

What temperature have your cards when they start to slow down? You can raise fan speed to lower temperature

[h2gvaka]

As your PSU is not that good it would limit first the power limit in Afterburner (50% for a first test, later you can go maybe to 60%), the memory clock you can push by +300 or +400, the core clock leave untouched or even lower it by -100 (i guess you mine ETH and this uses mainly the memory).

What temperature have your cards when they start to slow down? You can raise fan speed to lower temperature

Temperatures are steady on ~65 all the time, not changing. I'm running them on +100core, +500memory, 70% Power. But like i said even on stock 5 are working flawlessly, just this one has issues.

[Heimer]

Is this card new or used? If you can try to plug her into different system (could be even friend's PC) abd run some benchmarks. It could be card's by itself fault.

[Riddle]

Change riser

[h2gvaka]

Think I found the issue(10min benchmark looks good). I just unplugged one riser from main display adapter PICe and put it in another 1x PCIe. Luckly I got 7 PCIe board.

Guess the solution for people with 6 slots is would be to set in BIOS primary display slot to IGFX.

Thanks for answers guys.

[iaoorin]

I want to build 1070 rig, I have few choices:

Palit GeForce GTX 1070 Dual 8GB - 480e
Palit GeForce GTX 1070 Jetstream 8GB - 530e
Gainward GeForce GTX 1070 8GB - 480e
Gainward GeForce GTX 1070 8GB Phoenix - 530e

What do you think? Is the 480e cards good enough for ETH/Zcash mining, and is there big difference between these 4 cards? Can I dual mine with these cards?

[h2gvaka]

I want to build 1070 rig, I have few choices:

Palit GeForce GTX 1070 Dual 8GB - 480e
Palit GeForce GTX 1070 Jetstream 8GB - 530e
Gainward GeForce GTX 1070 8GB - 480e
Gainward GeForce GTX 1070 8GB Phoenix - 530e

What do you think? Is the 480e cards good enough for ETH/Zcash mining, and is there big difference between these 4 cards? Can I dual mine with these cards?

Well with high prices of the hardware right now your ROI will take some time, like 3 and a half months. Huge increases of difficulty every day is also not on your side, lets hope that price will follow at least. You won't probably get rich like early adopters but still you will see ROI and some gains, how much can't say it, all depends when will Ethereum move to POS and how much difficulty will go up. People are talking that after ETH goes POS something else will replace it, like ETC... and indeed it will but how profitable will it be that's a huge question.

I'm in the same boots like you, just started mining with 3 rigs. I would recommend you if you want to start, start asap. Time is not on your side.   

[Heimer]

If I'm not mistaken Palit and Gainward are exactly the same thing. Bear in mind that these cards are HUGE. Palit also have 3y warranty.

[iaoorin]

I want to build 1070 rig, I have few choices:

Palit GeForce GTX 1070 Dual 8GB - 480e
Palit GeForce GTX 1070 Jetstream 8GB - 530e
Gainward GeForce GTX 1070 8GB - 480e
Gainward GeForce GTX 1070 8GB Phoenix - 530e

What do you think? Is the 480e cards good enough for ETH/Zcash mining, and is there big difference between these 4 cards? Can I dual mine with these cards?

Well with high prices of the hardware right now your ROI will take some time, like 3 and a half months. Huge increases of difficulty every day is also not on your side, lets hope that price will follow at least. You won't probably get rich like early adopters but still you will see ROI and some gains, how much can't say it, all depends when will Ethereum move to POS and how much difficulty will go up. People are talking that after ETH goes POS something else will replace it, like ETC... and indeed it will but how profitable will it be that's a huge question.

I'm in the same boots like you, just started mining with 3 rigs. I would recommend you if you want to start, start asap. Time is not on your side.   

Thanks for answers. Well I was deciding btw AMD 580 and Nvidia 1070, and I think this one has better resale value if something went wrong. And you can mine more algos with this one so more coins. That is key factor I'm with nVidia this one. And AMD prices is just ridiculous, like 30-40% more then 3 months ago.