LG 5K Display - Thunderbolt 1 to USB-C?

Discussion in 'Mac Accessories' started by rtkane, Dec 21, 2016.

  1. rtkane macrumors regular

    rtkane

    Joined:
    Apr 29, 2010
    #1
    I've struggled to find the answer to this and have come across differing opinions on it--apologies if this is a duplicate question that's been previously answered--I didn't see any results in my search.

    Will the new LG 5K display allow me to connect a Thunderbolt 1 drive, with an adapter, into one of the three USB-C ports on the back? The Thunderbolt 3 port will be in use going directly to my MacBook Pro so I can't connect it there and am really hoping to only have the single cable going to my MBP. Here's what I'm hoping will work

    LG 5K Display
    Thunderbolt 3 port ---> MacBook Pro
    USB-C port ---> USB-C to USB-A dock for keyboard/dvd drive/USB Hub
    USB-C port ---> iPhone (with USB-C to lightning cable)
    USB-C Port ---> Thunderbolt 1 External Drive (with Thunderbolt 1/2 to Thunderbolt 3 adapter)

    Apple's chat agent said it would work, but I've read elsewhere that it won't. Any help is appreciated.
     
  2. hollandog macrumors regular

    hollandog

    Joined:
    Mar 13, 2014
    #2
    I think it should work. I can't guarantee until I test it next week.

    I plan to connect my existing TB2 dock to the Ultrafine 5k with the TB3 -> TB2 adapter.
     
  3. matreya macrumors 65816

    matreya

    Joined:
    Nov 14, 2009
    #3
    I doubt it will work because the monitor has USB-C ports, they are NOT thunderbolt 3 ports.
     
  4. hollandog macrumors regular

    hollandog

    Joined:
    Mar 13, 2014
    #4
    if it doesn't then I'll have to abandon my TB2 dock and get a USBC hub with ethernet. Luckily those are not expensive.
     
  5. rtkane thread starter macrumors regular

    rtkane

    Joined:
    Apr 29, 2010
    #5
    This is what's so confusing--hearing both yes and no. I hope it works, because it'll suck having to plug the one cable into the laptop all the time instead of just leaving it plugged into the monitor.
     
  6. dyn, Dec 23, 2016
    Last edited: Dec 23, 2016

    dyn macrumors 68030

    Joined:
    Aug 8, 2009
    Location:
    .nl
    #6
    I can see where it is confusing. From the description in the Apple store:
    There is only 1 TB3 port which you use to connect the display to the Mac. The other 3 USB-C ports are USB3.0-only (this is what Apple means with "5 Gbps" and it is their wording that can confuse you; in the tech specs they do list it correctly though) so you can only use those to connect USB hardware. Your TB drive needs to be connected to the Mac directly.

    Too bad this display doesn't come with a Thunderbolt daisy-chain option (which requires having 2 TB3 ports), ethernet port and headphone jack. It would have been the ultimate dock if it did.
     
  7. Scary Spice macrumors regular

    Scary Spice

    Joined:
    Jul 31, 2015
    Location:
    British Columbia
    #7
    I would pay anything if apple made this monitor (super thin of course) with the LG panel....

    All day long I have the Acer logo in my peripheral vision as I work.... :(

    I miss having an apple monitor on my desk and this would be the ultimate solution. 1 cable to my tb MacBook and nothing more.
     
  8. garyleecn macrumors 6502a

    Joined:
    Jul 25, 2014
    #8
    99% sure it won't work.
    the port on the back of lg 5k is usb3.1 gen 1, not thunderbolt. and it has less bandwidth (5g) than even thunderbolt 1 (10g)..
    not that you need all 10g for your hard drive, but there will be a compatibility issue. so your only option is to change the interface on your HD (to usb or usb-c), or change your HD all together. portable HD with usb-c interface isn't that expensive
     
  9. MrX8503 macrumors 68020

    Joined:
    Sep 19, 2010
    #9
    No it will not work.

    Let's ignore USB-C altogether and look at what the actual ports are. The ports on the LG 5K are USB 3 ports NOT thunderbolt.

    You have to connect your drive directly to your MBP using the TB3/2 adapter.
     
  10. glindon macrumors regular

    glindon

    Joined:
    Jun 9, 2014
    Location:
    Phoenix
    #10
    The display itself uses 26.5 Gbps of the 40 Gbps available for thunderbolt 3. Then after you subtract what bandwidth the webcam and speakers use and you're left a little more than 13 Gbps. That's barely above thunderbolt 1 bandwidth. And it's not even enough to run the 3 USB C ports on the back of the monitor at full USB 3.0 speed (5 Gbps x 3 = 15 Gbps).
     
  11. dyn macrumors 68030

    Joined:
    Aug 8, 2009
    Location:
    .nl
    #11
    Take a look at the official documentation regarding Thunderbolt 3: https://thunderbolttechnology.net/sites/default/files/Thunderbolt 3 Update Presentation_Computex 2016 v3.pdf Scroll down to page 14 and you get a nice graphical representation of the available bandwidth. As you can see TB3 has been designed to run 2 4k displays at 60Hz (which can be substituted with 1 5K display) whilst also being able to supply gigabit ethernet and USB3.1 Gen 2 (the 10Gbps version).

    If you look at the features of the 5K display and what users really like you immediately see the use case for an 80Gbps version of Thunderbolt. Too bad it can't do it right now because as I said earlier, a display with those options would be the ultimate dock if it did.
     
  12. rtkane thread starter macrumors regular

    rtkane

    Joined:
    Apr 29, 2010
    #12
    Thanks for everyone that responded... I can confirm that it does not work. Oh well, I guess I'll have to plug it directly into one of the MBP ports.
     

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