PhoenixMiner 5.2c (still beta) is ready with speed improvement for AMD 4 GB cards. You can download PhoenixMiner 5.2c from here (this is only the Windows version, the Linux version will be ready in a few days):
Updated Nvidia drivers to 457.30 and PhoenixMiner 5.2c do not start. Trying with start_miner.bat and miner do not starts...
C:\Mining\PhoenixMiner\PhoenixMiner_5.2c_Windows>PhoenixMiner.exe -pool ssl://eu1.ethermine.org:5555 -pool2 ssl://us1.ethermine.org:5555 -wal 0x008c26f3a2Ca8bdC11e5891e0278c9436B6F5d1E.Rig001
Phoenix Miner 5.2c Windows/msvc - Release build
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CUDA version: 11.0, CUDA runtime: 8.0
C:\Mining\PhoenixMiner\PhoenixMiner_5.2c_Windows>pause