iMac USB 3.0 Question

Discussion in 'iMac' started by jbg232, Feb 1, 2014.

  1. jbg232 macrumors 65816

    jbg232

    Joined:
    Oct 15, 2007
    #1
    I'm purchasing a new iMac and am worried about the wired keyboard. I am worried that the USB 2 interface will slow down the USB bridge. I have multiple USB 3 hard drives that I need to run at USB 3 speeds. From my understanding, the USB port speed is dependent on the 1st device the computer sees as apple states in their FAQ:
    Thus, if I have both my USB 3 hard drives and my USB 2 keyboard plugged in, is there any possibility that the drives will actually run at USB 2 speed?

    Anyone have any experience or answers to this question?
     
  2. macthefork macrumors 6502

    Joined:
    Feb 2, 2013
    #2
    They're talking about each of the four Ports. So, your USB 3 Drives will run at USB 3 speeds if they are the only thing plugged into a port. If you have a USB 2 keyboard plugged into one port and the USB 3 drive plugged into a second port, the USB 3 device will run at Usb 3 speeds.

    If you use a USB 3 hub, then this is where the USB 3 devices have to be plugged in first to get the proper speed on that port that the hub is plugged into.
     
  3. jbg232 thread starter macrumors 65816

    jbg232

    Joined:
    Oct 15, 2007
    #3
    So each port acts completely independently? I ask because usually 2 ports share the same bus internally at the motherboard level.
     
  4. macthefork macrumors 6502

    Joined:
    Feb 2, 2013
    #4
    On our Late 2012 iMac, I have one USB 2 hub plugged into one port (this I use for my older USB peripherals including the keyboard). The other three ports have USB 3 devices connected. All three USB 3 devices work at their proper speed.
     
  5. thedeske macrumors 6502a

    Joined:
    Feb 17, 2013
    #5
    Same for me - use a hub for wired key and mouse, printer - High speed USB drives attached to other ports. No problems
     
  6. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #6
    Nope, each port is completely independent of each other.
     

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