In theory, it was supposed to be correct, but in practice, performance is still a margin of the actual patchless. Decompression/compression/ encryption/decryption/ encoding/decoding/ calculations seems to be affected the most severely.
Synthetic tests may still run giving normal performance output but real workloads won't. Super Pi is usually 2-3 seconds slower with the method you mentioned over a non-patched BIOS.
Looking at the BIOS state, it seems AMD might have (most likely actually) pushed MSI to implement the patch at any cost. It is AMD who decides most of their platform decisions in case you didn't know.




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