Quote from: totikk on November 27, 2018, 10:58:02 AM

PhoenixMiner
I have 2 GPUs on a RIG. One - RX470, One RX480. Drivers 18.11.1
Miner says:
2018.11.27:13:12:49.984: main GPU1: Radeon (TM) RX 470 Graphics (pcie 1), OpenCL 2.0, 8 GB VRAM, 36 CUs
2018.11.27:13:12:49.984: main GPU2: Radeon (TM) RX 470 Graphics (pcie 1), OpenCL 2.0, 8 GB VRAM, 36 CUs
2018.11.27:13:12:49.984: main GPU3: Radeon (TM) RX 470 Graphics (pcie 4), OpenCL 2.0, 4 GB VRAM, 32 CUs
2018.11.27:13:12:49.984: main GPU4: Radeon (TM) RX 470 Graphics (pcie 4), OpenCL 2.0, 4 GB VRAM, 32 CUs

Mining Speed low... 11Mh per card...

Your cards are recognized but twice (the first two are your RX480 - it is listed as RX470 because of the video BIOS giving wrong device name string but it has 36 computing units, so it is the RX480). The reason is that the previous version of the drivers weren't completely removed before installing the new one. You should always remove the previous version of the drivers with DDU before installing the new ones. However, for the time being you can just add -gpus 13 to your command line to ignore the "twins" of your GPUs.

This should fix the problem and leave only two cards. If you have -gt in your command line, remove it and after starting the miner wait for a few minutes before the auto-tune finds the best GT values. During the auto-tune you will initially see low hashrate but then it will go up.

Quote from: zertor on November 27, 2018, 12:39:55 PM

Hi there,

How to use/activate those new kernels?
Do they are auto activated by default or do we have to type some addition command line option to activate them?

And for which models are affected? 10 series? older? any Nvidia GPUs?
Do they need specified driver version too for optimal performance,
or at least some driver version and above, say 4xx.xx and above?

Thanks

There is no need to change any settings, the new kernels replace the old ones. The difference is small but noticeable, especially with 1060 and 1050 cards. With 1080 and 1080Ti there is not much difference. With 9 series GPUs it is a bit of hit or miss but at least they aren't slower than the old kernels. It shouldn't matter which drivers you are using.

When comparing make sure to compare with roughly the same DAG epoch (i.e. compare with the result for the same coin, instead of comparing ETC with ETH hashrate) because there is small but noticeable slowdown of even the 10 series Nvidia GPUs with each new DAG epoch. Hopefully Nvidia would fix it in the drivers as AMD did but given that this wasn't fixed for the 9th series, we aren't too hopeful. Thankfully, it is quite small.