Here's an 850 EVO with Rapid mode enabled:Write: 2580.7 MB/s
Read: 2682 MB/s.
This is good! You're in a unique position here. Instead of running benchmarks, take a folder full of a bunch of different files, and copy it from one folder to another on your internal drive. Time how long it takes. It should be super-fast since it's just making hard links.External drive with four 256 gig NVMe WD Black drives striped RAID 0:
Read: 2303.1 MB/s.