Evidence of AMD Ryzen 9 4900H appears on 3DMark with a 4.4 GHz boost clock and an RX Vega 8 GPU - NotebookCheck.net News
Eight core mobile Ryzen 9 4900U Got Listed by Lenovo, shortly.
AMD Ryzen 9 4900U APU gets past the rumor stage by making a first appearance on UserBenchmark - NotebookCheck.net News
APU-Gerüchte: AMD Ryzen 9 4900U kommt als Flaggschiff der U-Serie - ComputerBase
AMD Ryzen 9 4900HS revealed to have 3.0 GHz base clock and 4.4 GHz boost clock; trails behind Ryzen 7 4800H in first 3DMark 11 tests - NotebookCheck.net News
AMD's Mobile Ryzen 9 4900U Listed by Lenovo | TechPowerUp
AMD Ryzen 7 4800HS appears in Time Spy CPU benchmarks - CPU - News - HEXUS.net
AMD Ryzen 9 4900U APU Make First Appearance On UserBenchmark | WePC