I have a Transcend JetDrive 825 (960) like this. Mine definitely has a TB1 or TB2 connection! Nothing with TB3. In terms of speed, the drive achieves about 600 MB/s write and about 740 MB/s read, which would be more like a TB1 10Gb/s. I'm not sure if the TB interface is the bottleneck. Not sure if the TB interface is the bottleneck though. Internally, the same SSD achieves over 1,400 MB/s, so it is at least to be assumed.