Depends on good scheduling choices since some threads benefit from the higher clocked CCD and others benefit from the higher cache CCD. Sounds like AMD is using a lookup table style scheduler on windows. I believe the system mostly schedules the higher clock CCD by default.

Similar problem to big.little but less differentiation between the cores. It's big.big. Kind of a mess outside of the primary use case that is games on windows with a static tuned scheduler.