Where to buy Thunderbolt to Mini Display Port 1.2?

Discussion in 'Mac Accessories' started by BenTrovato, Mar 2, 2016.

  1. BenTrovato macrumors 68020

    BenTrovato

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    #1
    Hey guys.. just wondering if anyone can share where they bought the cable from? Just figured out mine is 1.1 and looking for something to hook up to a 4k screen. Preferably 3-6ft white instead of black. I've been looking for a while but it seems more difficult to locate a 1.2. Hoping someone out there has that cable that works outputting 3840 x 2160 (or higher) and can share. Thanks..
     
  2. chrfr macrumors 603

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    #2
    Do you have a Mac that can output that resolution in the first place? https://support.apple.com/HT202856
     
  3. BenTrovato thread starter macrumors 68020

    BenTrovato

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    #3
  4. BenTrovato thread starter macrumors 68020

    BenTrovato

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    #5
  5. Tomorrow macrumors 604

    Tomorrow

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  6. BenTrovato thread starter macrumors 68020

    BenTrovato

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    #7
  7. Tomorrow macrumors 604

    Tomorrow

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    #8
    Ah okay.
     
  8. campyguy macrumors 68040

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    #9
    OP, for brevity, there are no/zero/nada/none DP 1.2-compliant TB cables. All TB1/2 cables are DP 1.1a-compliant.

    Also, very few DP 1.2-compliant (differentiating from "compatible") cables exist, referring to the DisplayPort.org Products portal. I bought, and used those very same StarTech DP cables - they're compatible, but not compliant with DP 1.2 as they return power over Pin 20 (I tested them myself).

    These are what I use, and specify for the company I own: http://www.amazon.com/Accell-B143B-...968076&sr=1-9&keywords=accell+displayport+1.2 (they're also on the DisplayPort.org portal).

    There's other options here: http://www.amazon.com/s/ref=nb_sb_ss_i_3_7/186-9880796-5202915?url=search-alias=electronics&field-keywords=accell+displayport+1.2&sprefix=accell+displayport+1.2,electronics,215

    I have no affiliation with Accell - there's no bonus for me here. Choose something else, IMHO you're wasting your money...
     
  9. BenTrovato thread starter macrumors 68020

    BenTrovato

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    #10
    Got it.. great explanation. Makes a lot of sense why it's so hard to find the right cable. Thanks for suggesting these ones, they look like the best ones I have come across thus far.
     
  10. BenTrovato thread starter macrumors 68020

    BenTrovato

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    #11
    Just noticed this 1.2 label cable in the box. I had read so many posts of people receiving the Dell p2415q without the 1.2 cable that I didn't even bother to check until now.
     

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  11. campyguy macrumors 68040

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    #12
    You're welcome. FWIW, I succumbed to the marketing BS of the other manufacturers before I landed on Accell's Amazon portal. FWIW, we (my office) DO have other DP 1.2-compliant cables - the cables that shipped with our Eizo displays. They're built really well, like the Accell cables, but the two knocks on the Eizo cables is that they're rated for either 1440p or 1600p and not 2160p, and they're frickin' almost impossible to get here in the US without getting a display and they're pretty spendy...

    I glanced at your other post, about the Dell cable that shipped with the display - I checked, they're not 2160p and they do return power over Pin 20. One more mention, since moving to compliant cables (Apple's TB cable, the Eizo cables, or the Accell cables - our Macs and PCs never freeze or panic now, unless it's a memory chip like what happened to my rMBP in November) - so, there's that too. I've wondered whether the power return back to the computer's onboard GPU was a source of hardware/software failures - it's pretty much been a non-issue since our video cable vendor change in October... Cheers!
     
  12. HenryAZ macrumors 6502

    HenryAZ

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    #13
    Your 4k monitor does not have a full size Displayport input? That's unusual. Monoprice has plenty of 1.2 Mini Displayport to Displayport cables. That's what I use with my Eizo 4k. I just wish the monitor makers would get on board with HDMI 2.0 inputs, so you could run 4k at 60Hz instead of 30Hz over HDMI.
     
  13. BenTrovato thread starter macrumors 68020

    BenTrovato

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    #14
    I see they have the select series cables now. I never noticed them before.
    --- Post Merged, Mar 6, 2016 ---
    What is the significance of returning power over pin 20?
     
  14. campyguy macrumors 68040

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    #15
    VESA's "standards" indicate power is to not be supplied/returned over Pin 20. The GPU would be supplied power from the display and the motherboard, often - but not always - at differing Wattages and Voltages. DP "standards" are a subset of VESA's "standards".

    I contacted VESA, which related that some of the cables we were using were likely not compliant, and sent me this text:
    "Power is provided by the DisplayPort connector on both the Source and Sink side (500mA at 3.3V, which is 1.5 watts). Power is not carried through a standard DP cable, otherwise the Source and Sink power supplies would conflict. Power is carried in a MyDP cable, however, to provide power to the MyDP Source (such as smartphone or tablet). Power is also used by a DisplayPort display adaptor by the Source, or for an active cable. Power is also used for a DP-to-optical converter at the Source, and optical-to-DP converter at the Sink and can be used this way for other signal conversion as well at either end. Power is not, however, carried through a standard DP cable. For one, there is no need for this and two, problems can result as described above."

    I often write construction contracts, and can often identify "boilerplate" or "uniform" language as I'd seen in that message from VESA (and it was sent in minutes, and nobody types that fast!), and found this lengthy post over at rage3d's forums, courtesy of Google:
    http://www.rage3d.com/articles/amd_eyefinity_displayport_difficulties/
    which led me to bust out my own multimeter and start checking for myself. We had issues with our AMD cards every day (our CAD production machines use Quadro cards), and quite often with our nVidia cards (on both Macs and PCs) - the poster has some experiences quite similar to those I had. The post was made over 3 years ago, is a good read, and makes me wish I'd seen it sooner. There's other similar posts at Anandtech's forums and (H)ardforums.

    Beyond that, most - but not all - of our displays put out power over Pin 20 (including my Dell displays) which means to me that they are also not VESA-compliant, a point that I haven't even tried to make in these forums. The Eizo displays and the cables that shipped with them do not return power over Pin 20 - no power whatsoever, and the BenQ BL271U displays also do not return power over Pin 20 (we just used the Accell cables already connected to the PCs with these BenQs). After a bit of my own investigation in my company's logs, the PCs connected to the Eizo displays never (or very rarely) BSODed or needed a component replacement outside our normal routine maintenance - and I can report that we have had sleep/overheating/freezing issues with the Dells. I'm not buying any more Dell displays because of this last point, at least not for the foreseeable future.

    Now I'm thinking I'm going to start up a distillery - my chemistry is much better than my electrical skills...
     
  15. BenTrovato thread starter macrumors 68020

    BenTrovato

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    #16
    Fantastic.. great explanation. Learned a lot more than I bargained for ;)
     

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