An AMD Ryzen 9 4900U APU has turned up on UserBenchmark as part of a system labeled "AMD Ted3-RN". The chip managed an excellent single-core score but the weaker multi-core scores show that this is an early engineering sample with more to come yet. The benchmark record details that the Ryzen 9 4900U has 8 cores and 16 threads.
https://www.notebookcheck.net/AMD-Ryzen-9-4900U-APU-gets-past-the-rumor-stage-by-making-a-first-appearance-on-UserBenchmark.459954.0.html