Can a MBP power dual 27" Apple Cinema Displays?

Discussion in 'MacBook Pro' started by skinnylegs, Mar 31, 2011.

  1. skinnylegs macrumors 65816

    skinnylegs

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  2. mulo macrumors 68020

    mulo

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    #2
    thunderbolt cannot supply the 17GBit/s required for running two of those.
     
  3. skinnylegs thread starter macrumors 65816

    skinnylegs

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  4. innominato5090, Mar 31, 2011
    Last edited: Mar 31, 2011

    innominato5090 macrumors 6502

    innominato5090

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    #4
    there's no hardware that currently let you do that. it would require some kind of adapter because without anything a display must go at the end of the thunderbolt chain.
     
  5. theSeb macrumors 604

    theSeb

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    #5
    Really?

    You're talking about Oranges, when the OP asked about Grapes and then your info about Oranges is incorrect as well.
     
  6. skinnylegs thread starter macrumors 65816

    skinnylegs

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    #6
    Now I'm confused. LOL So, can you run two 27"ACD's off a MBP?
     
  7. rnb2 macrumors regular

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    #7
    No - currently, Thunderbolt only supports one external monitor (I believe the laptop screen is also connected via Thunderbolt).
     
  8. mulo macrumors 68020

    mulo

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    #8
    while thunderbolt supports two bidirectional 10GBit/s channels only one can be used for driving a screen, the other is a PCI express channel and cannot be used for driving a display unless a graphics card is added.
     
  9. skinnylegs thread starter macrumors 65816

    skinnylegs

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  10. dusk007 macrumors 68040

    dusk007

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    #10
    2x27" is a little too much but the new GPUs support Display Port 1.2 which may or may not work with this whole mini DP Thunderbolt thing. Anyway DP 1.2 supports daisy chaining and two 24" displays should work. It doesn't have to be just one display at the end.

    Also adding an external GPU should help make it work.
     
  11. theSeb macrumors 604

    theSeb

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    #11
    Agreed, but it's not a bandwidth issue. Your original post was confusing. :)
     
  12. Hellhammer Moderator

    Hellhammer

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    #12
    Thunderbolt is based on DP 1.1a.

    It is. Thunderbolt can only provide 10Gb/s via its DisplayPort. Two 27" ACDs require more than that. The other 10Gb/s is for PCIe. With some kind of an external GPU it might work but with current equipment, this is not possible.
     
  13. LaazyEye macrumors regular

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    #13
    is it not true that Thunderbolt will self-upgrade to 100Gbps (via optical) later in the year? plenty of bandwidth...

    but i guess this doesn't really apply, since the OP is trying to do this with current stuff.
     
  14. Macsavvytech macrumors 6502a

    Macsavvytech

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    #14
    Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

    We don't know how the display port side things will behave when intel upgrades to optical light peak. It could be bi directional 100gb/s an one for mini display port an one for thunderbolt however it is more likely that the spec for display port will have to updated first. I think what I have said is correct, I like to keep up to date but don't always get it right.
     
  15. Hellhammer Moderator

    Hellhammer

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    #15
    It will most likely require a new controller. Your USB 2.0 port won't become USB 3.0 if you use a USB 3.0 cable. I haven't seen an interface where the controller would be able to provide better performance than the available cables. Otherwise Intel would have demoed it with optical already, and show that it really gets 100Gb/s.
     
  16. rockinrocker macrumors 65816

    rockinrocker

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    #16
    What about 2 smaller external monitors while in clamshell mode?
     
  17. Hellhammer Moderator

    Hellhammer

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    #17
    As long as they need less than 10Gb/s of bandwidth, it should work fine. Two 1920x1200 monitors should work as they require ~9.8Gb/s.
     
  18. amarcus macrumors 6502

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    #18
    Last I heard Intel was intending to create optical cables that have the optical transceiver built into the end of each cable. Therefore you would not need a new controller to see improved speeds...
     
  19. rockinrocker macrumors 65816

    rockinrocker

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    #19

    Sweet! That's one thing I've been wondering about. Are there existing adaptors for this to work with VGA/DVI? Or is that something we're still waiting on?
     
  20. Hellhammer Moderator

    Hellhammer

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    #20
    There is no device that lets you do this, yet. You will need a some kind of hub or a display that supports daisy-chaining, when they become available.
     
  21. rockinrocker macrumors 65816

    rockinrocker

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    #21
    Ah, I wondered about that. I suppose we shall see, eh?
     

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