3DMark confirms 4.3 GHz boost clock and SMT for AMD Ryzen 9 4900U
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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. Lenovo has been caught stating that the Yoga Slim 7 would support up to an "AMD Ryzen 9 4900U" too, although it has since reverted its UK product listing to up to "AMD Ryzen 7" processors.
According to this new 3DMark listing, the Ryzen 9 4900U has a maximum boost clock of 4.3 GHz, or 100 MHz higher than the Ryzen 7 4800U. Unsurprisingly, the 8 core processor also supports SMT, allowing it to execute up to 16 threads simultaneously. 3DMark reports that the Ryzen 9 4900U has a 1.8 GHz base clock too, but offers no details about TDP or the type of Radeon Graphics with which it has been paired.
However, the Ryzen 9 4900U could actually be the original name for the Ryzen 7 4800U According to @uzzi38 AMD rebranded the Ryzen 9 4900U to the Ryzen 7 4800U While we cannot confirm this, Renoir APUs can briefly boost 100 MHz over their maximum turbo clock speed as explained by Opto Crypto. Hence, the Ryzen 7 4800U can reach up to 4.3 GHz, 100 MHz above its advertised value. So, while there may be Ryzen 9 4900U versions of the Yoga Slim 7 out there, they may come to market as Ryzen 7 4800U models, instead. The lack of a Ryzen 9 U-series APU does seem like a lost opportunity though, especially as AMD has already released Ryzen 9 H-series and HS-series SKUs.