The new beta version is ready. You can download PhoenixMiner 5.4b from here:

The new features in this release are:

• New kernels for AMD Vega and Navi GPUs that are slightly faster when the DAG buffer is approaching or passing 4GB in size (the current ETH DAG is close to 4GB). To use these new kernels, you need to use drivers 20.5.1 or later under Win10, or 20.10.x or later under Linux
• Automatic re-running auto-tune as needed when switching to a different DAG buffer type (e.g. when switching from ETH to ETC, or back)
• Added support for the latest AMD Windows 10 drivers 20.12.1 and 20.11.3
• Fixed crash when trying to set -mvddc on very old AMD drivers (including the beta blockchain drivers from 2017)
• Other small fixes and improvements

Some notes on the best (or at least some of the better) drivers for AMD cards:

• If you have 6GB or 8GB card that is at least Polaris (i.e. 470/480/570/580, Vega, Radeon VII, Navi), you should run at least driver 20.5.1 under Windows 10, or driver 20.10.x under Linux.
• If you have 4GB Polaris card (i.e. 470/480/570/580), ideally you should also run drivers 20.5.1 or later. At the very least the drivers should be either 18.12.1.1 to 19.7.5 (inclusive), or 19.12.2 and later. Under Linux, drivers 19.x.x or 20.x.x should be OK for 4GB cards.
• Avoid using the 20.40.x, and 20.45.x drivers under Linux.

Please let us know if you have any problems or questions related to PhoenixMiner 5.4b.