PhoenixMiner 4.1c is the new stable release. You can find the download link and other information in the first post of this thread. If you have already downloaded and installed it, there is no need to do this again - there is no change from 4.1c that was published as a beta version.

  Yes, you can use -clkernel 3 only for some of the GPUs. Even if you set -clkernel 3, if given GPU doesn't have
enough video memory for double DAG, it will switch to -clkernel 1. For example if you want to use the turbo kernels for
the first GPU only from a five GPU rig, use the following command line option: -clkernel 311111


  This is caused by the size of the TLB, which is too small for the current DAG sizes and causes constant eviction from the TLB cache. AMD released the "compute mode" fix for RX4x0 and RX5x0 cards, which simply increased the memory page size. However there is no such fix for 290/390 cards. Probably there is no way to increase the page size on these cards because of hardware limitations but only AMD knows for sure. You can either mine coins with lower DAG (basically everything except ETH and ETC), or accept the hashrate drop (but it will get gradually worse over time).


  You have upgraded your driver to version that is not yet supported by PhoenixMiner (see the line Unknown OpenCL driver version! Hashrate and stale shares may suffer in the log, it will be printed as yellow warning on your screen when the miner starts). It is not a good idea to update to drivers that are newer than the release of PhoenixMiner you are using because this means we weren't able to test this release of PhoenixMiner with these drivers and they probably won't work well (or at all). To fix the problem either upgrade to PhoenixMiner 4.1c, which supports AMD drivers up to and including 19.1.1.



  (also to all miners experiencing problems with PhoenixMiner 3.5 and below versions when trying to create the DAG):

   The versions of PhoenixMiner before 4.0 only support DAG epoch up to 235. ETC passed epoch 235 a few weeks ago, and recently ETH also passed DAG epoch 235 and is now on 236. The unfortunate result is that the old version(s) of PhoenixMiner won't be able to create DAG or mine ETH or ETC any more - you must upgrade to PhoenixMiner 4.x.
   We have printed this warning here during the release of PhoenixMiner 4.0 but admittedly we could have done much better job with making it visible. We will pin this message in the first post too.



   We are working on RTX20x0 optimizations but they won't be ready until the next release.