Stefan Mileschin

MyDigitalSSD is now shipping one of the first USB enclosures for M.2 NVMe SSDs. The new M2X enclosure is based on the JMicron JMS583 USB 3.1 Gen 2 to PCIe 3.1 x2 bridge chip. This bridge translates the SSD's NVMe storage protocol into standard USB Mass Storage protocol or USB Attached SCSI Protocol (UASP), allowing for a portable SSD with much higher performance than the majority of portable SSDs that use SATA SSDs internally, while also offering much broader compatibility than Thunderbolt enclosures and portable SSDs like the Samsung X5.

The MyDigitalSSD M2X is a DIY kit for assembling a portable SSD with the user's choice of M.2 NVMe SSD. (M.2 SATA drives and M.2 PCIe drives that use AHCI instead of NVMe are not supported, but there are already plenty of enclosures for the former.) The bottleneck for sequential transfers will be the 10Gbps USB 3.1 Gen 2 host interface, which allows for around 1GB/s throughput. The JMS583 bridge chip is backwards compatible with USB 2.0 and the M2X is supplied with USB Type-C and Type-A cables, so the M2X will be plug and play with basically everything out there.
https://www.anandtech.com/show/13372...r-m2-nvme-ssds