And not only that. The K series is the unlocked high-performance version of the desktop series. Whereas U is the low-voltage/ultrabook version of the mobile ser

And not only that. The K series is the unlocked high-performance version of the desktop series. Whereas U is the low-voltage/ultrabook version of the mobile series. So they are sitting pretty much at the opposite end of the spectrum (if we remove server and phone CPUs from the picture), and it's no huge surprise that it still shows up as faster.