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Found the latest version of OpenACC 2.7 Specs: https://www.openacc.org/sites/default/files/inline-files/OpenACC.2.7.pdf
From above link says OpenACC now supports AMD ZEN CPUS: New PGI 18.4 Community Edition is Available | OpenACC
But I didn't answer your question about which AMD GPUs are compatible with OpenACC. According to this forum, PGI removed support for AMD GPUs after version 17.x came out.: https://www.pgroup.com/userforum/viewtopic.php?t=5557&sid=defc4566185b091c7523167c7cf786bd
Try asking your question at AMD OpenCL Forum: OpenCL . Seems like OpenACC uses Opencl programming.
FYI: Never heard of OpenACC so excuse me if I just posted information that you are already aware of.
Did you find an answer somewhere else?