I'm currently buying some new USB micro cables for my Samsung Galaxy S5. It supports both USB 2.0 micro and USB 3.0 micro connectors.

Will I see better charging times when using the USB 3.0 cable connected to a wall charger vs. a USB 2.0 cable? I would assume not, but I'm not sure. AFAIK, not too many things draw any more than 2A.


Theoretically, you shouldn't, since wall chargers can supply the same amount of current over a USB 2.0 cable as a USB 3.0 cable.

However, you might see a difference in difference in charging times due to the electrical properties of the cables. Because the USB 3 spec calls for a higher maximum current than USB 2 (950 mA vs. 500), it stands to reason that USB 3 cables will be better constructed and thus able to conduct higher amounts of current than run-of-the-mill USB 2 cables. See this Reddit thread for more information.

  • As with most things, it depends - most phone chargers have delivered > 1 A current for a while now (some going > 2 A) over USB 2.0 cables. A properly specced cable is probably fine; the higher current capability of USB 3.0 is mostly dependent on the host, not the cable. But cheaper cables tend to skimp wherever possible, and may be an issue - I have a cheap USB 2.0 extension cable here with a voltage drop of > 1 V over a metre... – Bob May 26 '14 at 23:07

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