In a recent article, we pointed out that we have yet to see a laptop with the Intel Core i9-9980HK outperform the MSI GE75 GS9, which runs the cheaper (and theoretically less powerful) Intel Core i9-9980H. A forum user by the name of littlezipp has posted evidence that the 9980HK in his Alienware m15 R2 thoroughly beats the 9980H in a 30-loop test of Cinebench R15. However, littlezipp nabbed this performance by way of a good undervolt and repasting his CPU with liquid metal.
https://www.notebookcheck.net/Apparently-the-Core-i9-9980HK-CAN-beat-the-Core-i9-9980H-under-the-right-circumstances.437052.0.html