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.



  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.