For the past few years, each generation of AMD Ryzen processors for desktop and laptop has been accompanied by a C series for Chromebooks, computers that are easy to handle and generally inexpensive. Obviously less efficient than their cousins, the C series processors nevertheless offer much better energy efficiency, with a thermal envelope of only 15 W. AMD announces an autonomy of 17 hours on the Ryzen 3 7320C and even 19 hours on the entry-level Athlons, even if the data provided by the manufacturers must always be taken with a grain of salt.
These processors do not take advantage of the latest Zen 3 and 4 architectures, but of the older version Zen 2; they directly compete with the small Core i3 from Intel as well as certain ARM chips. They do, however, ship a Radeon 610M iGPU in RDNA 2 which could well allow you to play indie games that are not very greedy. The Athlon models also have two cores clocked at 2.4 GHz while the Ryzen 3 7320C and Ryzen 5 7520C offer four, clocked at up to 2.8 GHz.
We should see this C series land on a few Chromebooks soon, notably the Dell Latitude 3445 and the Asus CM34 Flip.