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I've built 2 7 GPU mining rigs. Setup is the same for both of them.

Setup:
7 x Asus ROG Strix Radeon RX 580 8GB GPUs
1 x Z170A Gaming M5 Motherboard
1 x Inte Pentium Processor G4500 3.0 GHz CPU
1 x SanDisk SSD PLUS 120GB
2 x EVGA SuperNOVA 750 P2 PSUs
1 x Corsair Vengeance LPX 4GB DDR4 3000mhz
1 x Add2Psu PCU Adapter
7 x 16x to 1x Powered Riser Adapter Cards

OS: Xubuntu 16.04
Driver: AMDGPU-Pro Driver Version 17.10 for Ubuntu 16.04.2
Mining Software: Claymore Miner 9.5
Pool: ethermine.org

Claymore settings:

export GPU_MAX_ALLOC_PERCENT=100

./ethdcrminer64 -epool us1.ethermine.org:4444 -ewal MY_MINER.Miner02 -epsw x -etha 0 -mode 1 -tt 68 -ttli 79 -tstop 85 -allpools 1

GPUs are stock and not overclocked.

The problem is I'm getting very low hashrate on 2 of my GPUs. Maximum hashrate I've seen was only 141 Mh/s

Example logs:
ETH - Total Speed: 141.077 Mh/s, Total Shares: 5887, Rejected: 1, Time: 63:14
ETH: GPU0 4.140 Mh/s, GPU1 16.052 Mh/s, GPU2 24.174 Mh/s, GPU3 24.186 Mh/s, GPU4 24.185 Mh/s, GPU5 24.173 Mh/s, GPU6 24.168 Mh/s
--
ETH - Total Speed: 141.075 Mh/s, Total Shares: 5888, Rejected: 1, Time: 63:14
ETH: GPU0 4.140 Mh/s, GPU1 16.054 Mh/s, GPU2 24.178 Mh/s, GPU3 24.166 Mh/s, GPU4 24.182 Mh/s, GPU5 24.182 Mh/s, GPU6 24.173 Mh/s
--
ETH - Total Speed: 141.080 Mh/s, Total Shares: 5889, Rejected: 1, Time: 63:15
ETH: GPU0 4.140 Mh/s, GPU1 16.052 Mh/s, GPU2 24.173 Mh/s, GPU3 24.183 Mh/s, GPU4 24.175 Mh/s, GPU5 24.183 Mh/s, GPU6 24.175 Mh/s
--
ETH - Total Speed: 141.145 Mh/s, Total Shares: 5889, Rejected: 1, Time: 63:15
ETH: GPU0 4.140 Mh/s, GPU1 16.053 Mh/s, GPU2 24.198 Mh/s, GPU3 24.202 Mh/s, GPU4 24.183 Mh/s, GPU5 24.200 Mh/s, GPU6 24.169 Mh/s
--
ETH - Total Speed: 141.048 Mh/s, Total Shares: 5889, Rejected: 1, Time: 63:15
ETH: GPU0 4.140 Mh/s, GPU1 16.053 Mh/s, GPU2 24.177 Mh/s, GPU3 24.184 Mh/s, GPU4 24.170 Mh/s, GPU5 24.187 Mh/s, GPU6 24.137 Mh/s
--
ETH - Total Speed: 141.182 Mh/s, Total Shares: 5890, Rejected: 1, Time: 63:15
ETH: GPU0 4.141 Mh/s, GPU1 16.053 Mh/s, GPU2 24.195 Mh/s, GPU3 24.173 Mh/s, GPU4 24.189 Mh/s, GPU5 24.217 Mh/s, GPU6 24.215 Mh/s
--
ETH - Total Speed: 141.061 Mh/s, Total Shares: 5890, Rejected: 1, Time: 63:15
ETH: GPU0 4.140 Mh/s, GPU1 16.052 Mh/s, GPU2 24.179 Mh/s, GPU3 24.179 Mh/s, GPU4 24.161 Mh/s, GPU5 24.174 Mh/s, GPU6 24.176 Mh/s
--
ETH - Total Speed: 141.054 Mh/s, Total Shares: 5890, Rejected: 1, Time: 63:16
ETH: GPU0 4.140 Mh/s, GPU1 16.054 Mh/s, GPU2 24.172 Mh/s, GPU3 24.169 Mh/s, GPU4 24.176 Mh/s, GPU5 24.172 Mh/s, GPU6 24.172 Mh/s
--
ETH - Total Speed: 141.077 Mh/s, Total Shares: 5891, Rejected: 1, Time: 63:16
ETH: GPU0 4.139 Mh/s, GPU1 16.055 Mh/s, GPU2 24.171 Mh/s, GPU3 24.176 Mh/s, GPU4 24.172 Mh/s, GPU5 24.182 Mh/s, GPU6 24.181 Mh/s
--
ETH - Total Speed: 141.155 Mh/s, Total Shares: 5891, Rejected: 1, Time: 63:16
ETH: GPU0 4.140 Mh/s, GPU1 16.065 Mh/s, GPU2 24.170 Mh/s, GPU3 24.208 Mh/s, GPU4 24.213 Mh/s, GPU5 24.177 Mh/s, GPU6 24.182 Mh/s

Sometimes I'm even getting low hashrate on almost all GPUs:

ETH - Total Speed: 49.076 Mh/s, Total Shares: 5880, Rejected: 1, Time: 63:07
ETH: GPU0 4.140 Mh/s, GPU1 16.060 Mh/s, GPU2 5.616 Mh/s, GPU3 5.617 Mh/s, GPU4 2.945 Mh/s, GPU5 5.501 Mh/s, GPU6 9.197 Mh/s
--
ETH - Total Speed: 71.613 Mh/s, Total Shares: 5880, Rejected: 1, Time: 63:08
ETH: GPU0 3.015 Mh/s, GPU1 5.215 Mh/s, GPU2 5.273 Mh/s, GPU3 4.927 Mh/s, GPU4 4.747 Mh/s, GPU5 24.216 Mh/s, GPU6 24.220 Mh/s

What could be a problem here? I see mostly people using Windows for Ethereum 7 GPU mining, could it be OS problem? I prefer Linux for easier remote command line management and also I know it better than Windows.

I have the same issue on both on my rigs.

Thanks a lot ahead for any help.

Try new risers.

Bough new risers, will try it out. Thanks

Hello, I can help you fix your bios.
I had many throttling troubles with strix 470 and I solved them after a lot of search.

If you can upload your bios for me in a file sharing service I wiil be able to tell if I can help

Thank you, but at this moment I did not do anything to GPU bios. I wanted to get close to 24Mh/s on each card without any mods and then to start flushing them.

set pci-e to auto if you have it at gen 1.

Stock Bios can throttle your cards, I had this problem.

Was gone on vacation, when came back saw hashrate drop to 11 Mh/s per card.

Has anyone seen hashrate drop that low without any reason?


I've tried - did not do anything.


Also I tried with new risers - no change.

i've same problem with ewbf cuda, nvidia gtx 1070 cards. i cannot find solution

Are you using Windows or Linux?

I have built several rigs already and I am still doing it like I did the first time: 1 videocard at a time, plug in PCI-E x16 the first GPU, start the miner. Does it has good hashrate? Good, take it off and plug it in the riser and get the second gpu, plug it in PCI-E x16. Does it has good hashrate? Good, continue until you don't have any unplugged GPU's.

I started right away with the risers one by one, I will take your advice and try plugging it directly to the board.

I plugged my 1st GPU directly into 1st PCI-E x16 and the hashrate is around 2 Mh/s. Same if I plug it into 2nd PCI-E x16. Does it mean the card is damaged?

I doubt it is broken, can you try another operating system, like Windows 10? Also, did you plug the monitor in the GPU or are you connecting through network?

I plugged the monitor into GPU

Try windows, should work, I think it's a driver issue with your linux.

Installed windows - all cards work fine :) I guess linux drivers are not good. Thank you for your help.

You are welcome, mine every day now, don't stop the rig, difficulty is increasing massively, mine while you still can :).

Will do

I modified my GPU bios and right now I'm getting around 201 Mh/s per rig.



ETH - Total Speed: 201.806 Mh/s, Total Shares: 3, Rejected: 0, Time: 00:02
06:34:21:992    1ecc    ETH: GPU0 29.154 Mh/s, GPU1 28.899 Mh/s, GPU2 28.878 Mh/s, GPU3 28.295 Mh/s, GPU4 28.875 Mh/s, GPU5 28.848 Mh/s, GPU6 28.857 Mh/s

ETH - Total Speed: 201.533 Mh/s, Total Shares: 7, Rejected: 0, Time: 00:03
06:35:22:887    1ecc    ETH: GPU0 28.761 Mh/s, GPU1 28.884 Mh/s, GPU2 28.863 Mh/s, GPU3 28.336 Mh/s, GPU4 28.878 Mh/s, GPU5 28.904 Mh/s, GPU6 28.908 Mh/s

ETH - Total Speed: 201.324 Mh/s, Total Shares: 16, Rejected: 0, Time: 00:06
06:38:41:126    1ecc    ETH: GPU0 29.142 Mh/s, GPU1 28.847 Mh/s, GPU2 28.854 Mh/s, GPU3 27.964 Mh/s, GPU4 28.800 Mh/s, GPU5 28.855 Mh/s, GPU6 28.862 Mh/s

Are these ok hash rates? Seems kindda low to me but no matter what I did I could not make them stable at higher that 29.1 Also the power consumption is pretty high too. 1st rig 1100 W at the wall, 2nd rig 1140 W at the wall.

if I drop the voltage more or reduce my GPU clock the hash rate drops. Also I noticed that even I have 2133 MHz memory clock if I rise it say to 2150 MHz hash rate drops significantly.

Any comments on this? Are these numbers way off or they are ok for these cards?

These are modifications I've done:

http://imgur.com/6ZHR746

http://imgur.com/ygnHWB9

The hash rate is quite good.

What about the power? Is it normal? 1100W and 1140W at the wall.

Yes, the power consumption is normal but you can reduce it if you lower the GPU's core clock frequency to about 1150 mhz.

I've tried, but if I go below 1200 MHz my hashrate drops significantly. Few cards I did 1166 MHz and they were ok.

I also tried dual mining but then the power jumps from 1100W to 1400W. Not worth it I guess.

I mined in dual when Decreed was 35-45$, was profitable enough, for about 3 weeks I mine only 1 coin at a time, the power consumption and maximum usage of GPU's are not worth it, I also think they will go obsolete if mining for a long time in dual, not sure about this, I am just sure the GPU's will live more while mining 1 coin at a time.

i am facing the same problem with my gigabyte rx570 . i am using windows 10. i normally get 10-11mhs but once in a while after restarting or all of the sudden it run on 21-22 mhs but it start decreasing after that andf then got constant at 10 or 11 mhs
Can anyone please help me out ?