TechSpot published Samsung SM951 PCIe SSD 512GB
A quote from the article:
If Samsung's claims are true then the lack of NVMe support shouldn't be too devastating for the SM951 as read speeds are said to reach 2150MB/s and 1500MB/s for writes, which should give the SM951 an advantage in write tests over the Intel SSD 750 1.2TB.Samsung SM951 PCIe SSD 512GB Review @ Techspot