Microsoft seems to decide another move by ditching Intel's CPU as most laptop manufacturers do to catch up with AMD, also Apple just recently is going to the same thing, rather than AMD, but its own-made chipset.
The explanation behind the hypothesis is an unexplained Microsoft computer that has recently appeared on 3DMark. The device, which is believed to be a variant of Surface Laptop 4, is powered by AMD's Ryzen 7 4800U processor. The chipset was announced as part of the all-new Ryzen 4000 lineup at CES 2020 in January.
As you can see below, the CPU inside the unnamed device appears to be clocked at 4.21GHz. The Ryzen 7 4800U CPU is an octa-core CPU with a 16thread. It is a 7 nm chip, which provides clock speeds from 1.8 GHz to 4.2 GHz. The processor is designed specifically for ultrabooks and similar lightweight devices and has a 15W TDP. There is also a need for better thermal control to increase performance.
Whereas it is said that Microsoft is still reviewing other Surface Laptop 4 AMD processors. Another unidentified Microsoft device with the Ryzen 5 4500U clocked at 2.3GHz has recently been found on 3DMark. The 4500U is a hexacore processor that has boost clock speeds up to 4GHz.
It should be remembered that Microsoft released several AMD-powered Surface Laptop 3 models after sticking with Intel for the Gen-1 and Gen-2 lineups. Surface Laptop 3 is available in several configurations. It is powered by the Ryzen 5 3580U and Ryzen 7 3780U CPU in multiple variants. However, the newer AMD chips are faster and more power-efficient. So let's hope the next devices perform better than their predecessors.