https://arstechnica.com/gadgets/2020/07/amds-ryzen-3000xt-cpu-refresh-is-here-benchmarks-inside/

Today, AMD released three new Ryzen 3000 desktop processors—the Ryzen 3000XT line. These new CPU models, the Ryzen 9 3900XT, Ryzen 7 3800XT, and Ryzen 5 3600XT are minor refreshes of the existing Ryzen 9 3900X, Ryzen 7 3800X, and Ryzen 5 3600X models which add a couple hundred MHz extra boost clock speed to the original versions.

We'll go ahead and spoiler this one for you right away—if you've already got a Ryzen 3000 X-series desktop CPU, you don't need to rush out to buy a new one. These updates should be seen largely as a way to keep pressure on Intel while AMD is ahead, rather than something revolutionary.