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What You Need to Know About Thunderbolt 1&2 vs Mini DisplayPort

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If Thunderbolt 1 & 2 is Mini DisplayPort, Mini DisplayPort must also be Thunderbolt? Right? Wrong! There is a lot of confusion around Thunderbolt, Mini DisplayPort and connectivity. This is because both Thunderbolt and Mini DisplayPort use an identical connector, and the only difference is that the Thunderbolt connector can carry (in addition to the Mini DisplayPort), a Thunderbolt signal, which is a PCI-Express. Thunderbolt is fully compatible with Mini DisplayPort peripherals, and the new port is backward compatible, therefore it can still be used to connect to DisplayPort devices, BUT, only the new port can be used to connect to Thunderbolt devices.

What works, what doesn’t?

The image below shows which combinations of Thunderbolt (TB Cable) and Mini DisplayPort (DP Cable) will (green) and will not (red) work together.

This diagram refers to Thunderbolt 1 & 2 only

Clearly, there are some cases where the two technologies will work well together, but there are nearly two times as many combinations that will not. Computers with a Thunderbolt connector (usually designated with the Thunderbolt Logo – a lightning bolt shaped arrow), will function when connected to either Thunderbolt or Mini DisplayPort display, provided you are using a cable matching the technology of the display. However, a Mini DisplayPort enabled device will not function when connected to a Thunderbolt display or docking station.

The case for Thunderbolt: more connections

While Mini DisplayPort only allows for connections from your computer to a display, Thunderbolt goes well beyond that, allowing you to connect other Thunderbolt enabled devices such as docking stations, hard drive enclosures and RAID enclosures. When it comes to transferring data from a computer to an external hard drive or RAID enclosure, Thunderbolt offers far greater performance than USB 2.0 & 3.0, and even FireWire 400 & 800 and ExpressCard/PCIe. This is because Thunderbolt operates with two dedicated channels (one upstream and one downstream) each capable of speeds of 10 Gb/s or 20 Gb/s with Thunderbolt 2.

The comparison chart below illustrates just how efficient Thunderbolt is with handling media files :


Also, remember that Thunderbolt cables are required to connect two Thunderbolt devices together.

Next Steps

Check out our full range of Thunderbolt and DisplayPort accessories.

Talk to a StarTech Advisor about your Thunderbolt needs.

*This articles applies to Thunderbolt 1 & 2 technology only, Thunderbolt 3.


  1. Wiggles 6 years ago

    The DisplayPort PC -> DisplayPort LCD using a TB cable works; I am using a Thunderbolt cable in this way, and it works fine (which makes sense, since Thunderbolt cables are apparently just Mini-DP cables with more optional features.

    • BP247 8 months ago

      I’ve just bought a used iMac 27” 2009, which has a mini display port. I also bought a used 2016 Thunderbolt Display that obviously has a thunderbolt port. MDP COMPUTER -TB LCD. Have I messed up? Is this the only configuration, that you can’t get to work?

      • Danielle at 8 months ago

        Hi there! Unfortunately, there is no way to connect a DisplayPort/Mini DisplayPort computer to a Thunderbolt display. This is as pictured in the diagram above in red with either a TB cable or a DP cable. No converters exist for connecting a Thunderbolt display to anything other than a Thunderbolt host.

  2. WMO 6 years ago

    Thanks Wiggles, I have been worrying about whether DP PC -> DP LCD using a TB cable works, since I have ‘mistakenly’ ordered a TB cable.

    • SC 5 years ago

      Based on Wiggles’ comment:
      1) TB PC -> DP monitor via TB cable should also work
      2) There is no combination where a TB cable doesn’t work but DP does (therefore, TB cable is always equal or better)
      3) There are more combinations that will work (5) vs. not work (3)
      4) The only 3 combinations that will not work involve TB monitors (to my knowledge, only Apple produces one)

      • ptim 4 years ago

        I arrived here trying to figure out whether the following convoluted setup should work… spoiler: it doesn’t (in my case), either because I have a dud cable (unlikely), or it wasn’t designed to work this way 🙁

        DisplayPort-monitor to Apple-DisplayPort->-MiniDisplayPort-adapter to Apple-Thunderbolt->-USB-C to 2017 MacbookPro

        @SC’s comment gave me hope (makes sense to me!) but no dice here, so far… bummer if I have to buy a new monitor due to adapter fail 🙁

      • ptim 4 years ago

        oops! correction… my monitor is DVI out! no wonder it doesn’t work!

        Traded the thunderbolt adapter and am now successfully doing:

        DVI monitor out > HDMI female adapter > HDMI cable > generic USB-C dongle > Macbook

  3. Robert Libow 5 years ago

    I have purchased a Dell p2715Q and the display will not work from mini on the dell to the t
    TB port on my mac mini late 2014 2.6 g or on my macbook late 2014 2.6 g changed tb cables and display. Help please

    • Susan Mutterback 5 years ago

      Hi Robert,
      The diagram in the post will be able to help you a bit. By the sounds of it, you will need DP cable, not a TB cable. If you need more help, let us know what product you are using and we can get more assistance.

    • Ted Schultz 5 years ago

      Robert: Did you ever resolve this problem? I am having the same problem with a Dell P2415Q and a Mac Mini late 2014 connected with the mini-Display-port to Display Port connector that came with the display. The display works and the computer recognizes it, but fonts in Microsoft products and in Acrobat look blurred, while other fonts look sharp, for example in the Desktop. I’d like to know if this is a cable problem or something deeper.

  4. Kim Nuyen 5 years ago

    I just bought a DisplayPort 1.2 monitor that fails to run off my laptop’s Thunderbolt 1 port. Am I right in guessing this is because Thunderbolt 1 is only DisplayPort 1.1a capable? The monitor has no way to change DisplayPort versions for me to check. Funny thing is, the monitor runs off my desktop graphics card’s mini DisplayPort with no problem. Now this mini DisplayPort must be version 1.1, as it is an old card (Radeon HD 5970) that was released one month before DisplayPort 1.2 became available. Any insights?

    • Susan Mutterback 5 years ago

      Hi Kim,

      DisplayPort 1.2 is backwards compatible, so the issue should not be due to different DisplayPort revisions. When you use a Thunderbolt 1 computer with a DisplayPort monitor, you do need to use a Mini DisplayPort cable, not a Thunderbolt 1 or 2 cable. If you are using a Mini DisplayPort cable, we recommend you narrow down the issue further. If possible, also test the Thunderbolt 1 port with another monitor. If you are troubleshooting a product, please contact our technical support team. You can contact us in a number of ways, listed on our support page:

  5. Martins Rozentals 5 years ago


    While my main PC are on warranty service I got an idea to connect my main monitor ASUS PG278q with display port to my MacBook Air with thunderbolt, but my MacBook didn’t recognise monitor. Im using display port cable and thunderbolt port is working on Mac (Im using it with other monitor). Any idea why?

    • Susan Mutterback 5 years ago

      Hi Martins,

      Your question sounds like it requires some investigating, it would be best to contact our Support Team:

  6. Dave 5 years ago

    I want to use a 40″ 4K TV as a computer monitor. It will also be used to watch BluRay movies and occasionally even some over-the-air television shows. Computer applications include browsing, word processing, spreadsheets, photo editing, and some video editing, but no gaming.

    Sony’s 43-Inch 4K Ultra HD TV (XBR43X830C; 2015 Model) looks ideal because of its size and the review it gets.

    I want to drive the TV with Lenovo’s ThinkPad P40 Yoga PC (Intel Core i7-6500U; 16GB; 1TB SSD; 14-inch Full HD) because of its size, flexibility, weight, keyboard, etc. It contains the NVIDIA Quadro M500M 2GB graphics chip.

    The issue is that the TV has only HDMI inputs, and the computer’s 4K support is limited to its miniDisplayPort according to this review.

    I see the Sabrent Mini DisplayPort to HDMI Adapter that claims 4K support which would seem to close the gap. Sabrent says that it connects via Thunderbolt 2.

    As a neophyte, I’m sure there are caveats and gotchas that I don’t foresee. Can you please let me know if my plan looks workable? Do you seen any pitfalls?

    Thank you!

    • Susan Mutterback 5 years ago

      Hi Dave,

      This looks a like a question for our Technical Support team. They can be reached via our online chat tool, which you can find here: You can find additional ways to contact us here: (and are available 24×5, Sunday 9pm to Friday 9pm (ET)).


  7. Duy D. 5 years ago

    I just got a Dell UP3017, and having problem getting signals from my Mac Mini late 2012. The monitor claims that it does have signals from the displayports. I have tried both a thunderbolt cable, and a mini-displayport to displayport cable that came with the monitor.
    Thanks in advance.

    • Susan Mutterback 5 years ago

      Hi Duy, Our Support Team will be able to help you figure out the issue with your Thunderbolt cable and getting it connected to your monitor. Please reach out to the team via our online chat tool, which you can find here: You can find additional ways to contact us here: (and are available 24×5, Sunday 9pm to Friday 9pm (ET)).


  8. Kevin 4 years ago

    So, the only way to get dual screen capability out of the StarTech docking station (as pictured above) is to have a real Thunderbolt display? There’s no way to trick an HDMI or DVI display into acting like a TB display? I didn’t read the fine print before buying one of these docking stations and now I can’t get my two displays working (since neither is a TB display). Thanks for your help.

    • Susan Mutterback 4 years ago

      Hi Kevin,
      I would definitely suggest chatting with our Technical Support team if you have questions about one of our docking stations. They will be able to help you out getting dual displays or offer some solutions/shortcuts. We are actually working on an update for this post right now, to incorporate more technologies and situations. Stay tuned for new post!

  9. Mark1004 4 years ago

    I am wanting to go Thunderbolt on Mac to a DVI display, so a DVI port, not a mini DP port on the display.

    Can I use either a mini DP or a Thunderbolt on the computer side as long as it is DVI on the display side? This article doesn’t say anything about DVI. I’m wondering if I have to use one or the other for DVI.

  10. Keven 4 years ago


    I’m very green to all of this but I have a macbook pro with at mini port and purchased a Apple Thunderbolt Display but am having trouble connecting. Is it because I’m going from mini port to thunder port? Any ways around this?

    Thank you

    • Andrea McDonald 3 years ago

      Hi Keven, thanks for contacting us. In order to provide appropriate support with this, please talk to one of our Technical Advisors at or call us directly at 1-800-265-1844. Thank you!

  11. Harrison 3 years ago

    I am trying to connect to monitors to my MacBook Air. One monitor has an HDMi/VGA Port and the other has a VGA/DVI port. I connected the HDMI with the thunderbolt and is working fine. The other VGA to a USB port is not working. What adaptor would work for the VGA and DVI port? Can a 3-1 thunderbolt port support two monitors?

    • Andrea McDonald 3 years ago

      Hey Harrison, we will need a little bit more information to help you with this. Please contact our Support Team via Live Chat @ or phone @ 1 800 265 1844. Thank you!

  12. Dan Q 3 years ago

    Anyone know how I could connect a windows PC to my apple thunderbolt display?

    I got an HDMI input to displayport output converter, and plugged in the thunderbolt cable from the display in to the converter (via a diaplayport to MiniDP cable) and it didn’t work

    Any ideas?

    • J. D. McMurtry 3 years ago

      The captive (i.e. non-removable) data-in cable attached to the Apple Thunderbolt Display accepts *only* Thunderbolt signal. While it’s true that a DisplayPort video datastream would normally be one of the streams encoded within the Thunderbolt signal, the display is designed to be used *only* with a Thunderbolt host, and is unable to interpret a “naked” DisplayPort signal on the line. The display can be used with a PC *if and only if* the PC has Thunderbolt-out capability, either built-in or added via an expansion card.

      Any version of Thunderbolt (“TB”) on the PC host should work. If the host uses Thunderbolt version 1 or 2, it will have one or more Mini DisplayPort-shaped Thunderbolt ports, into which you can plug the cable from the display directly. If the host uses Thunderbolt 3, it will have one or more USB-C-shaped connectors, to which you can connect the display by way of a TB3-to-TB2 adapter (which has a male USB-C-shaped connector on the upstream end, and a female Mini DisplayPort-shaped connector on the downstream end). Also, I haven’t checked, but it’s possible that a Thunderbolt 3 dock is available somewhere that features a TB1/TB2-style (Mini DisplayPort-shaped) TB port; if so, this would be an alternative to a dedicated TB3-to-TB2 adapter.

      Note that earlier Apple display models, such as the Cinema Displays, know nothing of Thunderbolt and will happily accept plain old DisplayPort input.

      Good luck!

  13. Karen 3 years ago

    I’d like to use my iMac (late 2009, 21.5″) as a second monitor sometimes with my newer MacBook Pro. I purchased the DP to DP cable but Cmd+F2 does nothing and I don’t see it as a setting option in System Preferences. Is Target Display Mode simply not an option with my iMac? Thanks!

    • Danielle 3 years ago

      Hi Karen! Great question. According to Apple, the 21.5” version of the 2009 iMac does not allow target display mode. Please read here for more information:

  14. Phil 1 year ago

    Can I use the thunderbolt to connect to monitors

    • Danielle 1 year ago

      Hi Phil! If your computer has a Thunderbolt port it can be used to connect monitors as Thunderbolt carries both video and data!

  15. Bryant 1 year ago

    I’m trying to connect my Dell laptop to my iMac and use my Mac as a larger monitor. My Dell has Display Port or HDMI connections for Video out. My iMAC only has TB or USB connections. How can I do a video out from my laptop to my Mac with these connection types? What cable or adapters do I need? Thanks for the help!

    • Danielle 1 year ago

      Hi Bryant! Unfortunately, a Thunderbolt display or device requires a native Thunderbolt computer. Also, Target Display Mode (using an iMac as a monitor for another computer) requires the computer connecting to the iMac to also be a Mac device.

  16. Robbo 1 year ago

    TB1 TB2 TB3 are IMHO all failures.. If they were’nt Apple would still be using TB1
    I am looking for a Docking Port for my “latest” Mac Book and its “SO” new none of the mainstream manufacturers have been giving the rights to the latest “Thunderbolt” chip sets needed for protocol transfer. The difference between USB C and TB3 is about $1000

    Apple fails horribley by intrducing new and uncharted ports. Quite honestly if I had realaised this piece of crap only had 2 x TB3 ports I would not have purchased it!! What is the sence in producing the worlds thinest laptop top if u need to go out and buy a cumbersome docking station to connect an external !!!

    just more cables more confusion more failures more frustrations , all at the end users costs

    Apple should draft a user manual particulary short cuts and gestures .. with each new model , that would save a lot of head aches. In certain places that dont have on-line inet communications, help is not available. Why not use some SSD space to store help files for end user.At least Mac has decent online help forums, without any support from mamma Mac .. Thank God Mac is a cult users machine ..

    Lets see what TB 4 brings to the table .. last years Mac ,one off, $10K display, that wont work on your new toy??

    Better “Technology” is one thing, corporate greed and dominance is another

    • VaughnSC 1 year ago

      You do know Thunderbolt is Intel tech? Any manufacturer claiming they’re waiting on Apple specs is full of…‘it.’

  17. Robbo 1 year ago

    @ Danielle

    As far as I know Mac is the only supplier of TB 3 Monitors. Dell made some TB2 but havent seen any TB3, yet. Some backward compatabilty is available , consider, Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter @ $69.00. ea under the Apple tree.. & ffs make sure you get genuine mac as the have the chips in each end to provide TRUE 20Gbps transfer and support DP 1.4 transfer ( USB C is DP 1.2 protocol )

    Ahh throw another bit of junk in the land fill

  18. thesillybean 1 year ago

    Hey, I bought a z-book 15 with an Intel core i7 4800mq, 16gb of ram, and a Nvidia Quadro k1100m GPU. I was wondering if I could run an egpu using thunderbolt 2?

    • Danielle at 1 year ago

      Unfortunately, we do not currently have an enclosure that will support the use of an eGPU over TB2 or TB3.

  19. DMZO 5 months ago

    HI! I want to use a Microsoft Surface Pro 4 (Mini DisplayPort) as a second monitor for my 2014 MacBook Air (Thunderbolt 2). I’ve done loads of research and can’t seem to find a cable that will help me do this. Can it be done??

    • Danielle at 5 months ago

      Hi there! The Microsoft Surface Pro 4 Mini-DisplayPort port is for output only. There is no hardware solution to use it as a monitor, but you may be able to find a third-party software solution.

  20. Kasper R. 1 month ago

    I have several Apple devices and I need confirmation that my 13″ MacBook Pro, 9, 1 (MId 2012) with a thunderbolt port connect to my 24″ iMac 9, 1 (Early 2009) with a MiniDisplayPort.

    Pls. confirm that a MiniDisplayPort cable with male to male ends will provide the option for dual display.
    Appreciate your reply, thanks.


    • Danielle at 1 month ago

      Hi Kasper! According to the specifications of your 2012 MacBook Pro, yes you can connect your 2009 iMac using a standard mini DisplayPort cable (such as our 6’ Male to Male cable MDISPLPORT6). If you plan to use your iMac with target display mode, I would recommend checking out Apple’s requirements listed here: for more information. This would give you a single display on your MacBook Pro and a second display using your iMac. If you would like further assistance connecting additional devices, please connect with our support team and we would be happy to assist.


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