The Adata XPG SX8000 512GB is an SSD that uses the faster PCIe NVMe interface and M.2 form factor that puts regular SSDs that rely on the older and slower SATA 3 connection in a PC’s motherboard to shame.
Along with SSDs such as the Samsung NVMe SSD 960 Pro M.2 and the Toshiba OCZ RD400 512GB SSD that utilise this newer interface, the Adata SX8000 is not held back by SATA 3, which often bottlenecks performance on regular SSDs.
That’s why we’re seeing many SATA 3 SSDs usually benchmark around the 530MB/s read and 520MB/s write sequential speeds – whereas M.2 drives can hit much faster speeds, with Adata promising incredibly impressive rates of 2400MB/s read and 1000MB/s write.
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https://www.techradar.com/reviews/adata-xpg-sx8000-512gb-pcie-nvme-m2-ssd/2