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At a glance
Sandisk WD Black SN850X 4TB M.2 PCIe 4.0 Gen4 x4 NVMe SSD PC/PS is a 4TB M.2 (2280) SSD using PCIe 4.0 (x4), with sequential reads up to 7300 MB/s. It is listed at one UK shop, which is not showing stock right now.
From the retailer
4TB WD Black SN850X, M.2 (2280) PCIe 4.0 (x4) NVMe SSD, 7300MB/s Read, 6600MB/s Write, PC/PS5
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