Thank you for the amazing bug report! This is exactly how it is done The problem is here: Unknown OpenCL driver version! Hashrate and stale shares may suffer - this means that the miner can't recognize the driver and is forced to use the generic kernels, which doesn't support most DAG configs. The quick fix is to upgrade to driver 20.10-1048554 or downgrade to driver 19.50-967956. We suspect that you are using driver 19.50-1011208, which is not supported because somehow it "fell through the cracks" and was never even tested. We will add support for it in the 5.4c for sure.