About . The ev All-Terrain Case with Thunderbolt cable

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about . The ev All-Terrain Case with tethered Thunderbolt cable
I intend to buy a solid hard drive (ev ssd raw) and I have a MacBook pro retina with thunderbolt 2 and want the All-Terrain Case with Thunderbolt cable for add more speed to the transfer data not for protection just in order to increase the speed and the efficiency of the thunderbolt
Is there a difference in speed?
is the All-Terrain Case with Thunderbolt cable will give me different in speed …?