NVMe is supported basically from Haswell refresh and newer, according to Samsung, pretty much Z97 and newer. NVMe has worked on some Z68/Z77 mobo's, as a bootable drive, but requires hijacking the bios code, installing raid drivers with NVMe modules etc and is about as reliable a procedure as surgery done by a blind man. Highly not recommended, stick to standard Sata drives.
As you probably know, the mainboard manufacturers offer only for the newest Intel Chipsets (Z97 and X99) BIOSes, which include full NVMe support. That means, that older Intel Chipset systems like Z68 and Z77 natively are not able to boot into NVMe-SSDs like the Intel 750 Series or the Samsung...
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Real difference between Sata and NVMe for boot is 1-3 seconds at best. For most applications, especially games, there's no difference at all. The only place NVMe is a serious benefit over Sata is in dealing with large file transfers, where individual files are 10Mb±, and with games the files are usually in the Kb size.
As someone already said, NVMe, 'meh'.