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One of the best things about NVM Express is that you don’t have to worry about drivers showing up. Linux has had NVMe support since kernel 3.1; Windows 8.1 and Server 2012 R2 both include a native driver, and there’s a FreeBSD driver in the works. When Apple decides to support NVMe, the latter should make it easy to port.
However, BIOS support is largely lacking. Without an NVMe-aware BIOS, you can’t boot from an NVMe drive, though anyone with a x4 PCIe slot or M.2 connector can benefit from employing an NVMe drive as secondary storage.