The Tech Report published a review on the Samsung's SM951 PCIe SSDed
A quote from the article:
Samsung's SM951 SSD squeezes a quad-lane PCIe Gen3 interface onto a diminutive M.2 form factor. It offers incredible performance under the right conditions, but it also struggles in some scenarios. Our in-depth review explains the drive's strengths, weaknesses, and unique enthusiast appeal.Samsung's SM951 PCIe SSD reviewed @ The Tech Report