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The Hackintool shows the actual CPU info. Whereas, the system report fetch the CPU info from the specific Mac model. As per my check, the MacBookPro 15,4 uses i5 and i7 models in two of their Mac models and the i5 variant is 8257U and the i7 variant is 8557U which are of 1.4GHz and 1.7GHz speeds respectively. If you haven't done any changes in the SMBIOS, it should really show 1.6GHz as that's what your actual processor is capable.


Also, some Laptops are configured to have different clock speed when in AC/battery mode. So, check on that as well.


It would be good if you can attach your EFI.