CDRLabs.com published a review on the Western Digital WD_BLACK SN850 1TB NVMe PCIe 4.0 SSD
A quote from the article:
Western Digital has clearly put a lot of time and effort into their new WD_BLACK SN850 SSD. In an effort to deliver the full potential of next-gen PCIe Gen4 technology, everything, from the WD_BLACK G2 controller to the 96-layer BiCS 3D TLC NAND flash, has been developed in house.Western Digital WD_BLACK SN850 1TB NVMe PCIe 4.0 SSD Review