USB 3/USB 2 question

Discussion in 'MacBook Pro' started by woodbine, Jul 19, 2012.

  1. woodbine macrumors regular


    Aug 8, 2010
    Bath, UK
    Looking at buying a new MBP and want to know something about the USB ports before I jump.

    I have a few USB 2 items, like Wacom Tablet, full-size Apple keyboard , BluRay burner and USB 2 drives.

    If I get a USB 3 hub and a USB 2 hub, then plug them into each USB port, will the USB 3 port speeds be compromised by the other port having everything USB 2?

    I would assume not, but you never know.....I do know that mixing USB 2 & 3 on the same bus will compromise the speeds of any USB 3 drives attached.
  2. borisiii macrumors 6502

    Jul 4, 2010
    As soon as you put in any USB 2.0 hardware, it acts as a bottleneck for everything 'downstream' of it. For mice/keyboards/tablets/printers you won't see any performance issues since they don't approach the max throughput of USB 2.0, but USB 3.0 devices will definitely perform slower.

    In theory using a USB 2.0 device in a USB 3.0 port shouldn't give it any speed boost, but anecdotally I have seen faster transfer rates.

    With all that said though, you might decide it's worth getting a USB 3.0 hub since clearly you are interested in extracting maximum performance from your setup - especially since, unlike thunderbolt peripherals, they aren't particularly bank-breaking.
  3. 99ta316 macrumors newbie

    Jul 7, 2012
    I had not had seen a performance hit when I had my USB 3 drive in one and a USB 2 in the other. They should be on a separate bus and not cause a conflict. However you may see a hit if you were to say plug in a USB 2 device on the USB 3 hub. All the USB 3 devices may slow down, but I am currently unable to test this.

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