The Ryzen 9 4900U has appeared on 3DMark again, this time sporting a 4.3 GHz boost clock. Running on an “AMD Majolica-RN” motherboard, the Ryzen 9 4900U supports SMT across its 8 cores. Previously seen on UserBenchmark and advertised with the Yoga Slim 7, AMD is yet to confirm the existence of the Ryzen 9 Renoir APU.

The Ryzen 9 4900U will not go away. Despite not being formally announced, the Ryzen 9 4900U has been benchmarked on 3DMark. Published by @TUM_APISAK, 3DMark reports the Ryzen 9 4900U installed on an “AMD Majolica-RN” motherboard rather than the “AMD Ted3-RN” that UserBenchmark showed last month.
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https://www.notebookcheck.net/3DMark-confirms-4-3-GHz-boost-clock-and-SMT-for-AMD-Ryzen-9-4900U.464749.0.html