USB 3 hubs vs USB 2 hubs
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  1. #1
    Tech Guru astromech's Avatar
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    Default USB 3 hubs vs USB 2 hubs

    Is there any difference between the USB 2 and USB 3 spec regarding what current they can offer connected devices? Basically, can a unpowered USB 3 hub offer enough juice compared to a powered USB 2 hub?
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  2. #2
    Tech Guru mostapha's Avatar
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    Not really. If you need powered, you need powered, and it's never a bad thing.

    I'm under the impression USB 3.1 can provide more power specifically to charge devices that need it, but I'm pretty sure they require external power to do it.

  3. #3
    Tech Guru astromech's Avatar
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    Quote Originally Posted by mostapha View Post
    Not really. If you need powered, you need powered, and it's never a bad thing.

    I'm under the impression USB 3.1 can provide more power specifically to charge devices that need it, but I'm pretty sure they require external power to do it.
    Well that's poo.
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  4. #4
    Tech Guru the_bastet's Avatar
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    USB 2 provides 500MA, while USB 3/3.1 provides 900MA. The charging stream is the same for both at 1.5A - 2A. You will still need a powered hub for multiple devices which require USB power. The limitation is not from the format, but from splitting the power and energy delivery among multiple ports at once.
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