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This is a very minor problem

This is the result of my mining speed

ETH - Total Speed: 176.250 Mh/s, Total Shares: 164, Rejected: 0, Time: 01:03
ETH: GPU0 29.310 Mh/s, GPU1 30.241 Mh/s, GPU2 29.269 Mh/s, GPU3 29.297 Mh/s, GPU4 28.826 Mh/s, GPU5 29.261 Mh/s
GPU0 t=57C fan=71%
ETH: 04/24/17-09:03:41 - New job from europe.ethash-hub.miningpoolhub.com:17020
ETH - Total Speed: 176.020 Mh/s, Total Shares: 164, Rejected: 0, Time: 01:03
ETH: GPU0 29.307 Mh/s, GPU1 30.220 Mh/s, GPU2 29.174 Mh/s, GPU3 29.275 Mh/s, GPU4 28.750 Mh/s, GPU5 29.294 Mh/s
Setting DAG epoch #19...

GPU 1 is samsung and doing 30.220 mh/s as expected.

GPU4 is also samsung with the same set up. 1190 clockspeed and 2135 memory speed. It's doing only 28.750 mh/s

The rest are hynix doing normal 29.25 mh/s

I wonder why.

If I remove the 4 hynix card then both samsung will clock 30.220 mh/s

GPU-z       Watttool    Wattool PCI-e   Claymore    power   voltage mem voltage 
1           0           0       0       1   75  910 900 samsung
0           4           20      1       4       910 900 samsung
2           2           8       2       5       910 900 
3           3           14      3       2       910 900 
4           1           2       4       3       910 900 
5           5           36      5       0       910 900 

I know that claymore #4 correspond to wattool number 4 too in my graph (index 20). I know that by pressing 4 in claymore and see that GPU go up and down on the correct index at watttool.

enter image description here

You can see that this is the exact same set up with Claymore #1 (watttool 0)

And somehow GPU1 makes 30.220 mh/s and GPU 4 a mere 28.750 mh/s.

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  • Turns out I found out what the problem is. The GPU clock is only 1080 rather than 1180 where it should have been. What should I do with this question?
    – user4951
    Apr 24 '17 at 16:27
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I concentrated on the memory clock. Turns out the GPU clock for GPU 4 is only 1090, which is what I put for hynix memory. For samsung memory, to reach 30.2 mh/s I should put 1180 GPU clock at least.

I guess mixing 2 types of GPU have it's drawback.

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