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I believe that there are four 3.1 ports and two 2.0 ports. On top of the desktop are two of the 3.1s (as mentioned) and on the back of the desktop there are four more ports. I would say that the two higher up ports (with blue) are the 3.1s and the ones beneath (in black) are 2.0s. The ports on top of the desktop are blue as well so it would only make sense.
Sorry, there was a problem. Please try again later.Generally the black ports in the back are USB 2.0, while the other blue ports are USB 3.1 (including the top)
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