They had to manually underclock the E-cores to get better efficiency than the P-cores, which isn't surprising; Intel's power management has historically been ba

They had to manually underclock the E-cores to get better efficiency than the P-cores, which isn't surprising; Intel's power management has historically been based around the idea of "race to idle" - running at a high speed so you could complete the task faster and shut off the CPU sooner. AMD makes heavy use of downclocking their cores but this causes all kinds of headaches with performance regressions on real loads because of course it's not possible to predict in advance how much CPU time arbitrary code will need.