NVMe SSD Gen 3 vs Gen 4 running at PCIe 3.0. Samsung 970EVO Plus vs Samsung 980 PRO on Dell XPS 9500 - YouTube
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