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Asus quietly introduces new ZenBook UM425 and VivoBook Flip TM420 14-inch laptops with Ryzen 4000U CPUs - NotebookCheck.net News
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AMD launches the Ryzen 4000U series and claims it takes the ULV performance crown - NotebookCheck.net News
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AMD Ryzen 4000 Mobile Processors: Fighting Intel in the Notebook Space with 7nm Zen 2 | Hardware Times
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