One of the first PCIe Gen 4 NVMe SSDs to market has been the Corsair Force MP600.
Corsair Force Series MP600 GS review - Corsair's new mid-range SSD
Corsair MP600 PRO LPX SSD Review and Benchmark – Changing Gear
Corsair Force Series MP600 GS review - Corsair's new mid-range SSD
Corsair Force MP600 PCIe 4.0 NVMe SSD Benchmarks On Linux Review
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Windows 10 May 2020 vs. Linux Performance On AMD Ryzen
Corsair MP600 PRO LPX SSD Review and Benchmark – Changing Gear
Corsair Force MP600 Review 1TB NVMe PCIe Gen4 x4 M.2 SSD - Page 3 of 6
Corsair Force MP600 Review 1TB NVMe PCIe Gen4 x4 M.2 SSD - Page 3 of 6