Upgrade. A quad-core and an MX150 in a notebook that weighs a mere 1.3 kg - the Chinese manufacturer has upgraded its 2018 model of the Air to a level on a par with the Mi Notebook Pro. Despite identical specifications the two differ in performance though, as our extensive review shows quite clearly.
https://www.notebookcheck.net/Xiaomi-Mi-Notebook-Air-13-3-2018-i5-8250U-MX150-Review.291744.0.html