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  1. #1
    Maximum Number Of USB Capability

    Member Since
    Dec 18, 2010
    Posts
    182
    Specs:
    iMac 21.5" 3.06 GHz 4GB 500GB HDD i3 Processor ATI Radeon HD 4670 with 256MB / iPhone 3GS 8GB
    Maximum Number Of USB Capability
    HI Guys,

    I was just wondering I have obviously got my 4USB ports on my Mac and I have a 4 USB Hub external adapter! I only have 1 hub left out of those 8!
    I just spoke to my dad and he said running 12 might be a bit to much to ask from the computer! What do you guys think is the maximum USB ports I could run of my 21.5" iMac without causing damage or slowing it down?

    I look forward to your fast reply!

    Cheers,

    Matt

  2. #2
    Maximum Number Of USB Capability
    s2odin's Avatar
    Member Since
    Oct 23, 2010
    Posts
    836
    Specs:
    C2D 2.26 | 500GB Seagate Momentus | 2GB 1066 (soon to be 8)
    It all depends on what you have plugged in.

    If you have lots of energy-hungry products (printers, scanners etc) those will force the port to stop working since they are drawing so much power. If they are just mice / external hard drives etc it should be fine.

    I would recommend an AC powered hub tho just to be safe.
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  3. #3
    Maximum Number Of USB Capability

    Member Since
    Dec 18, 2010
    Posts
    182
    Specs:
    iMac 21.5" 3.06 GHz 4GB 500GB HDD i3 Processor ATI Radeon HD 4670 with 256MB / iPhone 3GS 8GB
    Would one of those be expensive? (AC powered usb hub) All in this is what I have plugged in AT THE MOMENT! LOL!

    iPhone sync cable (from mac)
    Extra Hub
    USB Extender (Running from hub)
    2x External HDD's (1 from mac the other from the hub)
    Camera Sync cable (sometimes) - (USB extender cable)
    Printer (from hub)
    that is just about it I have 2 more apple sync cables that I need to use to sync all of my gadgets at once!

  4. #4
    Maximum Number Of USB Capability
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,052
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    Yes with all that a mains powered hub.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  5. #5
    Maximum Number Of USB Capability

    Member Since
    Dec 18, 2010
    Posts
    182
    Specs:
    iMac 21.5" 3.06 GHz 4GB 500GB HDD i3 Processor ATI Radeon HD 4670 with 256MB / iPhone 3GS 8GB

  6. #6
    Maximum Number Of USB Capability

    Member Since
    Dec 18, 2010
    Posts
    182
    Specs:
    iMac 21.5" 3.06 GHz 4GB 500GB HDD i3 Processor ATI Radeon HD 4670 with 256MB / iPhone 3GS 8GB
    Targus Desktop 7-Port USB 2.0 hub with AC Adapter - Hub - 7 ports - Hi-Speed USB: Amazon.co.uk: Computers & Accessories

    That one looks very good! Another amateur question when I plug my iPhone into my non powered USB Hub it says charging is not supported with the one I just linked to would it charge my iPhone etc from that?

  7. #7
    Maximum Number Of USB Capability
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,052
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    The Targus is a good brand. Can't answer your iPhone question as don't have one. If an iPhone charges via USB then it should charge from the Targus.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  8. #8
    Maximum Number Of USB Capability
    hughvane's Avatar
    Member Since
    May 18, 2008
    Location
    Banks Peninsula, New Zealand
    Posts
    3,296
    Specs:
    MacMini 2.4, 8 Gb, OS 10.10 and 10.6; MacBook 2.4, 4 Gb, OS 10.6.8
    Another √ vote for the Targus. It has two 1000 mA ports for high-demand devices, eg, charging a phone. I don't use the audio pass-through on my Targus, as it generates a buzz/hum, audible through the external amp/spkr system.
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    Please post your Mac (or other) specs and MacOS version in your post, your profile or your signature. It helps us to help you better.

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  9. #9
    Maximum Number Of USB Capability

    Member Since
    Dec 18, 2010
    Posts
    182
    Specs:
    iMac 21.5" 3.06 GHz 4GB 500GB HDD i3 Processor ATI Radeon HD 4670 with 256MB / iPhone 3GS 8GB
    Cool! I will take my old crappy bush hub back and get the targus

  10. #10
    Maximum Number Of USB Capability
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    31,485
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.7.5
    Here's an article regarding how much power a USB port on a computer "puts out":

    What Is the Power Output for a USB Port? | eHow.com

    500mA seems to be a common value. So you would have to sum up the total milliamps drawn for all USB devices plugged into a computers single USB port...to know if you're getting close to that ports power output limit.

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  11. #11
    Maximum Number Of USB Capability

    Member Since
    Dec 18, 2010
    Posts
    182
    Specs:
    iMac 21.5" 3.06 GHz 4GB 500GB HDD i3 Processor ATI Radeon HD 4670 with 256MB / iPhone 3GS 8GB
    Thanks !

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