http://www.macvidcards.com/nvme-driver1.html
This is a very cool development. Note you can use NVME for data storage but not as a boot drive in OSX. Driver has been tested with Intel P3700 series and Samsung SM1715 and SM951 series. Requires OSX version 10.11. There is an FAQ at the bottom of the licensing page.
The driver is free.
Thanks to JimJ740, MacVidCards and the others who participated in its development.
NVME driver for OSX Released
Moderator: James Steele