ThinkComputers has a 1TB Kingston KC2000 M.2 NVMe solid state drive on the test bench. Here's a quote from the full review:
This drive makes use of the Silicon Motion SM2262EN controller, 96-layer 3D TLC NAND, and two 512MB DDR3L cache chips. Kingston tells us that this drive is capable of reads up to 3200 MB/s and writes up to 2200 MB/s, so it is no slouch in the performance department.