The numbering might be throwing you off because there's no 4000 series for the non-APU desktop parts, so these are the direct successor to the 3000-series chips that you just bought. Most companies come out with some new product ever 12 - 18 months, so it's hardly surprising that AMD would have new chips (or even just rebranded stuff if there weren't all new chips) at some point. The 3700x launched well over a year ago, so if you only bought one just recently you did so towards the end of the lifecycle for the product.This is getting way out of hand....AMD Ryzen 5000 series????
I recently bought an AMD Ryzen 3700X...good grief.