One year, ago, MPG reviewed the OWC Mercury Aura for the 2013 Mac Pro in a 2TB configuration. Now OWC ups the ante with a 4TB internal SSD, which is 4X the highest capacity that Apple offers. The original factory SSD can be repurposed into an external USB3 enclosure.
The Mac Pro is a quiet-running machine. With a 4TB internal OWC SSD, many users might ponder a nearly silent system with hard drives needed only for backups. With up to 128GB memory, there is a lot of room to run with the Mac Pro.