With this CPU design some cores are optimised for performance (at the expense of using more power) while some cores are optimised for efficiency (using the least power at the expense of computing performance). This makes sense for laptops and smartphones, as it can save power and thus run longer when being powered by batteries. But (in my opinion) not for Desktop PC's where most people care more about computing performance than saving a few watts.
With this CPU design some cores are optimised for performance (at the expense of using more power) while some cores are optimised for efficiency (using the least power at the expense of computing performance). This makes sense for laptops and smartphones, as it can save power and thus run longer when being powered by batteries. But (in my opinion) not for Desktop PC's where most people care more about computing performance than saving a few watts.