Ryzen 3xxx would be the 3rd generation of Zen CPUs. For example, an Ryzen 3200U (U means it has an embedded GPU, basically an APU) would be low-end, Ryzen 3500

Ryzen 3xxx would be the 3rd generation of Zen CPUs. For example, an Ryzen 3200U (U means it has an embedded GPU, basically an APU) would be low-end, Ryzen 3500 would be middle-end, and Ryzen 3700/3900 would be high-end.