JMicron Type-C NVMe SSD to USB 3.1 Gen 2 Adapter – Not Quite Ready for Prime Time

We have had this sitting on out Test Bench for some time and I thought I might do a little playing with it and throw a few tests out there.  It is a JMicron USB 3.1 Gen 2 to PCIe/NVMe adapter and it uses a Type-C connector.

This adapter accepts a M.2 SSD up to a 2280 form factor and is controlled by JMicrons own JMS 583 bridge controller.



This adapter won’t be available anytime soon and you will note that it will require some fine tuning, but it is capable of 1GB/s read and write throughput as well as TRIM.


For our testing today, we are going to take advantage of our latest SSD, the Toshiba XG6 NVMe 1TB SSD.  Check out our full report on this drive here.


ATTO Disk Benchmark is perhaps one of the oldest benchmarks going and is definitely the main staple for manufacturer performance specifications. ATTO uses RAW or compressible data and, for our benchmarks, we use a set length of 256mb and test both the read and write performance of various transfer sizes ranging from 0.5 to 8192kb. Manufacturers prefer this method of testing as it deals with raw (compressible) data rather than random (includes incompressible data) which, although more realistic, results in lower performance results.


ATTO was a very strong start for the JMicron adapter and reached speeds above 1GB/s as advertised.  Typically when we see this steady increase in performance as sample sizes increase, this is an indication of a solid device.  We might mention at this point that, because the solution is a bare bones solution without any type of heat dissiptaion or cooling whatsoever, we threw a fan on it.

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