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I bought the new Samsung 980 Pro 1TB (PCIe 4.0) and put in the Lenovo Yoga Slim 7 (PCIe 3.0), I saw only ~10% decrease in raw performance : r/AMDLaptops
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SAMSUNG 980 PRO Series - 2TB PCIe Gen4. X4 NVMe 1.3c - M.2 Internal SSD - MZ-V8P2T0B/AM - Walmart.com
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NVMe SSD Gen 3 vs Gen 4 running at PCIe 3.0. Samsung 970EVO Plus vs Samsung 980 PRO on Dell XPS 9500 - YouTube
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Samsung 980 NVME M.2 PCIe 3.0 SSD Samsung SSD Solid State Drive | MZ-V8V250BW 250GB SSD | MZ-V8V500BW 500GB SSD | MZ-V8V1T0BW 1TB SSD | Internal Solid State Drive | Lazada PH
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