Compared with competitor’s solution such as OWC Express 4M2, each of the M.2 PCIe slots only provides PCIe 3.0 ×1 bandwidth. But for Netstor NA622TB3, because it has a built-in PCIe switch, each of the M.2 PCIe slots is able to provide PCIe 3.0 ×2 bandwidth for doubled performance when reading one single M.2 NVMe SSD.

For example:
new macOS Mojave can only use single disk/SSD as a boot drive, so when you use one of the single NVMe SSDs as bootable drive from macOS, you can get doubled speed from Netstor’s solution.