SAMSUNG XP941 Series MZHPU512HCGL-00000 M.2 512GB PCIe Gen2 5Gb/s up to 4 lanes MLC Internal Solid State Drive Review
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This thing is fast, literally the fastest SSD available today with speed of 1.1GB/sec or more.
Con Can be difficult to set up as boot drive
It may be a bit difficult to set upd this drive as the boot drive as the tech is still pretty new, but there are guides out there to help users figure it out.