M. 2 SSDs can use either the PCIe bus or SATA bus, and the 850 Evo is a SATA 6Gbps drive\u2014it's no faster than a normal 2.5-inch SSD. Its main advantage is the smaller M. 2 card form factor, which is of benefit in NUCs, Mini-ITX builds, or in ultra-thin laptops.
