@jussi_laako per your request I have a good news for you. Very exciting! Big leap for the mankind.
AMSDM7EC 512+fs now can upsampling to DSD1024 (source from 44.1 to 176.4) on my i9 system. i9 12900k w/ DDR5 w/ RTX3070 CUDA offload, installed Ubuntu Server 20.04 w/ hwe-edge and HQPlayer Embedded 4.28.3-107 AMD build. Although the 48 family is still a little bit stuttering (average once per 1min) but I believe it can be optimized.
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