This is why I would NOT buy a Gen4 NVME SSD (yet) - YouTube
PCIe Gen 4 vs Gen 3: Do you need to spend extra on SSDs?
CS3140 M.2 NVMe SSD
Amazon.com: INLAND Performance SSD 2TB PCIe 4.0 M.2 Internal Solid-State Drive NVMe Gen4 x 4 with DRAM Up to 5,000 MB/s, 3,600 TBW 3D TLC NAND : Electronics
980 PRO PCIe® 4.0 NVMe™ SSD 1TB Memory & Storage - MZ-V8P1T0B/AM | Samsung US
AORUS NVMe Gen4 SSD 2TB|AORUS - GIGABYTE Global
Amazon.com: SAMSUNG 980 PRO SSD 1TB PCIe 4.0 NVMe Gen 4 Gaming M.2 Internal Solid State Drive Memory Card + 2mo Adobe CC Photography, Maximum Speed, Thermal Control (MZ-V8P1T0B),Black : Electronics