@gsuberland A few months ago I was cloning an old whitebox computer to a Dell Optiplex 7010 mini-PC. The old computer had a 250 GB Crucial MX200 SATA SSD, the new one a 512 GB NVMe drive (don't remember what make). Started up fast enough (around 150 MB/s, I was piping ntfsclone through lz4 and over the network), but write speed slowed down to 20 MB/s after a few minutes and stayed there until the end.