A Matisse Refresh AMD Ryzen 9 3900XT desktop processor has been spotted on Geekbench 5.1 along with a Gigabyte X570 Aorus Master motherboard. The 12-core chip recorded results that put it in the same ballpark as the Ryzen 9 3900X and Intel Core i9-10900K, but it is likely better scores can be squeezed out of it yet.
https://www.notebookcheck.net/AMD-Ryzen-9-3900XT-manages-credible-results-on-Geekbench-placing-it-in-the-company-of-the-Ryzen-9-3900X-and-Intel-Core-i9-10900K-but-its-predecessor-offers-better-value.477271.0.html