Figure 1 : ENCU3NV-JO1 with USB Type-C SuperSpeed 10Gbps certified cable. Enclosure has USB Type-C receptacle. Bus powered device. The USB-C SuperSpeed 10Gbps certified cable photographed is found on my gadget bin, perhaps sold separately.
Figure 2 : ASUS Zenith Extreme motherboard have several USB ports. Ports with SS10 marking have a capability to perform SuperSpeed 10Gbps transfer. Ports with SS marking is up to SuperSpeed (it is 5Gbps).
Experiment 1 : USB 3.1 Gen2 connection
Figure 5 : CrystalDiskMark 5.5.0 result. Different computer with ASM3142 USB host controller, Intel 8700K, Asus ROG Strix z370-i. ENCU3NV-JO1 's performance number is very good for USB3.1 Gen2 device.
Experiment 2 : USB 3.1 Gen1 connection
Figure 6 : Next, the adapter is connected to SS marked port using Type-C to Type-A connector. It is linked with SuperSpeed (5Gbps).
Figure 7 : CrystalDiskMark 6.0.2 result. Performance number is reasonably good for USB3.1 Gen1 device but it is significantly slower than Gen2 (Fig. 4 and Fig.7).Conclusion and thoughts
M.2 M-Key to USB 3.1 Gen2 adapter performs better with SuperSpeed 10Gbps connection than SuperSpeed.
SuperSpeed is reasonably fast. SuperSpeed 10Gbps speed gain may become more obvious with large file copy. I think this enclosure is suitable for video editing file exchange. In order to maximize the performance of this M.2 to USB3.1Gen2 enclosure, it is better to use high performance SSD, because inexpensive SSDs performance plummets when larger file is copied. Also it may be better to attach heatsink to the metal enclosure to prevent thermal throttling.
