Brand | Cable Matters |
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Item model number | 101021 |
Item Weight | 0.64 ounces |
Product Dimensions | 7.28 x 1.73 x 0.59 inches |
Item Dimensions LxWxH | 7.28 x 1.73 x 0.59 inches |
Color | black |
Manufacturer | Cable Matters |
ASIN | B00PJ3LSIG |
Country of Origin | China |
Is Discontinued By Manufacturer | No |
Date First Available | December 2, 2013 |

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Cable Matters Active Mini DisplayPort to HDMI Adapter (Active Mini DP to HDMI) Supporting Eyefinity Technology 4K Resolution
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Return this item for free
We offer easy, convenient returns with at least one free return option: no shipping charges. All returns must comply with our returns policy.
Learn more about free returns.- Go to your orders and start the return
- Select your preferred free shipping option
- Drop off and leave!
Bundles with this item
Purchase options and add-ons
Compatible Devices | Apple MacBook, MacBook Pro, MacBook Air, iMac, Mac mini, Mac Pro; Microsoft Surface Pro/Pro 2/Pro 3; ThinkPad X1 Carbon, X230/X240s, L430/L440/L530/L540, T430/T440/T440s/T440p/T530/540p, W530/W540, Helix; Dell XPS 13/14/15/17, Latitude E7240/E7440, Precision M3800; Alienware 14/17/18; Acer Aspire R7/S7/V5/V7; Intel NUC; Zenbook; HP Envy 14/17; Google Chromebook Pixel; Zeusbook Edge X6; Toshiba Satellite Pro S500, Tecra M11/A11 See more |
Specific Uses For Product | Monitor,Projector |
Connector Type | Mini DisplayPort |
Color | black |
Item dimensions L x W x H | 7.28 x 1.73 x 0.59 inches |
About this item
- Lightweight and portable Thunderbolt to HDMI adapter for connecting a Mini DisplayPort (Mini DP or mDP)/Thunderbolt 2 port compatible computer to an HDTV, monitor, or projector with HDMI; A separate HDMI cable (sold separately) is required for this HDMI to Mini DisplayPort Adapter
- HDMI to Mini DP adapter transmits both audio and video from computer or tablet to HDTV display; HDMI to Thunderbolt adapter supports video resolutions up to 3840x2160 (Ultra HD) at 60 Hz and flawless audio pass-thru for uncompressed digital 7.1, 5.1 or 2 channels
- Gold-plated connectors of the Mini Display to HDMI adapter resist corrosion, provide rigidity, and improve the signal performance
- Active Mini Display Port to HDMI adapter support AMD Eyefinity Multi-Display Technology and Nvidia Surround Display
- Compatible with Apple MacBook, MacBook Pro, MacBook Air, iMac, Mac mini, Mac Pro; Microsoft Surface Pro/Pro 2/Pro 3 (NOT Surface for Windows RT); ThinkPad X1 Carbon, X230/X240s, L430/L440/L530/L540, T430/T440/T440s/T440p/T530/540p, W530/W540, Helix; Dell XPS 13/14/15/17, Latitude E7240/E7440, Precision M3800; Alienware 14/17/18; Acer Aspire R7/S7/V5/V7; Intel NUC; Zenbook; HP Envy 14/17; Google Chromebook Pixel; Zeusbook Edge X6; Toshiba Satellite Pro S500, Tecra M11/A11
Customers usually keep this item
This product has fewer returns than average compared to similar products.
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Sustainability features
This product has sustainability features recognized by trusted certifications.Safer chemicalsMade with chemicals safer for human health and the environment.As certified byGlobal Recycled Standard
Products certified to the Global Recycled Standard (GRS) contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product. In addition, social, environmental, and chemical criteria related to processing are required. The purchase of Global Recycled Standard (GRS) certified products demonstrates demand for recycled content and best processing practices in the supply chain.Certification BodyIntertekCertification NumberTE-00066022Recycled materialsContains at least 50% recycled material.As certified byGlobal Recycled Standard
Products certified to the Global Recycled Standard (GRS) contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product. In addition, social, environmental, and chemical criteria related to processing are required. The purchase of Global Recycled Standard (GRS) certified products demonstrates demand for recycled content and best processing practices in the supply chain.Certification BodyIntertekCertification NumberTE-00066022Worker well-beingManufactured on farms or in facilities that protect the rights and/or health of workers.As certified byGlobal Recycled Standard
Products certified to the Global Recycled Standard (GRS) contain recycled content that has been independently verified at each stage of the supply chain, from the source to the final product. In addition, social, environmental, and chemical criteria related to processing are required. The purchase of Global Recycled Standard (GRS) certified products demonstrates demand for recycled content and best processing practices in the supply chain.Certification BodyIntertekCertification NumberTE-00066022Part ofClimate Pledge Friendly
From the brand

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Cable Matters, with headquarters in Southborough, Massachusetts, offers a complete line of cables, adapters, docking stations, and networking products for the home, office, and data center. Cable Matters offers first-class, quality, and affordable products backed by an exceptional customer experience.
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Mini DP Cables & Adapters
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Mini DP 1.4 Adapters
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Product Description

Active Portable Adapter
The Cable Matters Active Mini DisplayPort to HDMI Adapter is an indispensable companion for your Mac, PC, or tablet equipped with Mini DisplayPort. Connect your laptop or tablet to an HDTV for ultra-high-definition video (4K @ 60Hz) and audio streaming or to a 4K monitor or projector with this portable adapter and an HDMI cable (sold separately). The low-profile connector with molded strain-relief design increases durability.

4K UHD Video & Authentic Audio
- HDMI 2.0 video resolution up to 3840 x 2160 @ 60 Hz
- Includes HD 1080p and below
- Supports DisplayPort 1.2 HBR2 and 4:4:4 Color
- Audio support for 2, 5.1, and 7.1 channels
- HDCP compatible for viewing protected content

Living Room or Office or Classroom
- Stream video to a UHD TV
- Extend your workspace to a 4K LED monitor
- Broadcast a presentation on a projector
- Mini DP to HDMI is NOT bi-directional. It only connects to a display with HDMI.
- Active adapter supports AMD Eyefinity Multi-Display Technology
Mini DP & Thunderbolt 2 Compatible
- Mac computers with Thunderbolt 2
- Windows computers with Mini DisplayPort
- NOT Thunderbolt 3 compatible
Non-Blocking Design
- Gold-plated Mini DP connector
- Non-Slip surface provides easy handling
- Low-profile connector heads
Lightweight Adapter
- Weighs less than 1 ounce
- 4-inch cable tail
- Travels easily in a laptop sleeve
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Active Mini DP to HDMI Adapter
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Mini DP to HDMI Adapter
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Mini DisplayPort to HDMI Adapter
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3-in-1 Adapter
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8K Mini DP to HDMI Adapter
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Customer Reviews |
4.5 out of 5 stars 1,102
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4.6 out of 5 stars 532
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4.6 out of 5 stars 2,521
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4.4 out of 5 stars 1,359
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3.8 out of 5 stars 105
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Price | $16.99$16.99 | $14.99$14.99 | $9.49$9.49 | $18.49$18.49 | $27.99$27.99 |
Thunderbolt 2 Port Compatible | ✓ | ✓ | ✓ | ✓ | ✓ |
Color | Black | Black / White | Black / White | Black / White | Black |
Max Resolution | 4K@60Hz | 4K@30Hz | 1080P@60 Hz | 4K&30Hz (HDMI), 1080p@60Hz (VGA / DVI) | 8K@30Hz |
Model Number | 101021 | 101031 | 101001 | 101020 | 101101 |
Compare with similar items
This Item ![]() Cable Matters Active Mini DisplayPort to HDMI Adapter (Active Mini DP to HDMI) Supporting Eyefinity Technology 4K Resolution | Recommendations | |||||
Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | |
Price | $16.99$16.99 | $17.99$17.99 | $13.99$13.99 | $9.99$9.99 | -17% $9.49$9.49 List: $11.49 | -17% $24.99$24.99 List: $29.99 |
Delivery | Get it as soon as Thursday, Apr 17 | Get it as soon as Thursday, Apr 17 | Get it as soon as Thursday, Apr 17 | Get it as soon as Thursday, Apr 17 | Get it as soon as Thursday, Apr 17 | Get it as soon as Thursday, Apr 17 |
Customer Ratings | ||||||
Sold By | Cable Matters | Cable Matters | bonoch Official | Cable Matters | Cable Matters | Amazon.com |
connector type | Mini DisplayPort | HDMI | Mini Displayport/Thunderbolt/Thunderbolt 2 to HDMI | thunderbolt, mini displayport | HDMI | HDMI |
number of ports | 2 | 1 | 1 | 3 | 1 | 1 |
current rating | 1 amps | 2 amps | 1 amps | 1 amps | 1 amps | 1 amps |
power plug type | — | no plug | — | no plug | no plug | no plug |
Product information
Technical Details
Additional Information
Customer Reviews |
4.5 out of 5 stars |
---|---|
Best Sellers Rank | #269 in DVI-HDMI Adapters |
Warranty & Support
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Cable Matters Active Mini DisplayPort to HDMI Adapter (Active Mini DP to HDMI) Supporting Eyefinity Technology 4K Resolution
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers find the DisplayPort adapter works well with Surface devices and supports 2560x1080 resolution, enabling a third monitor with Radeon 7850 graphics card. The adapter receives positive feedback for its functionality and value, with one customer noting it works well for presentations on 4K screens. Build quality and connection strength receive mixed reviews - while some find it well-made and reliable, others report it wearing out after a few months and experiencing connection issues. Support for 4K at 60Hz is also mixed, with some customers verifying it works while others say it doesn't achieve 60Hz at 4K resolution.
AI-generated from the text of customer reviews
Customers report that the adapter works flawlessly, particularly with multiple Surface devices, and one customer mentions it functions well with a 2048x1152 monitor.
"...these adapters from Cable Matters, and now have my setup working flawlessly again...." Read more
"...Conclusion: Reasonable price, works reliably for systems requiring an "Active" adapter, quality construction, and relatively small size...." Read more
"This one is working great. Even on crappy design of surface SP3 pro, it still output 3840x2160 on my Sony 65" 850c without dropping out frames...." Read more
"...The command line tool works fine for me so I'll stick with that...." Read more
Customers find the adapter works well, with one customer specifically mentioning its compatibility with Surface Pro 4 docks.
"...This is an active adapter which is ideal when connecting several monitors but this is useless in my case since I only have one external 27"..." Read more
"...All 3 are on 1080p monitors. This being an ACTIVE adapter is what did the trick. Tried other DP to HDMI adapters with no luck...." Read more
"...Look, it's an active cable which works just fine on multiple Surface devices and a Lenovo. I've bought a bunch of these because ... they matter...." Read more
"...Forward a few months and now the Cable Matters adapter doesn’t work at all! Absolutely no signal. Of course I can’t return it...." Read more
Customers are satisfied with the adapter's resolution capabilities, supporting 2560x1080, 4K, and 1440p resolutions, with one customer noting its compatibility with early 2011 MacBook Pro.
"...However, the Mac Mini has a mini DisplayPort, which can output the full 2560x1080...." Read more
"Received the product and immediately tested it. Worked great, full 4K from 2012 Mac Mini...." Read more
"...Found and tried this and it worked as advertised, allowed me to display 2560x1080...." Read more
"...You can then scale the resolution in your System Settings and have an absolutely beautiful experience...." Read more
Customers find the adapter to be good value for money, with one mentioning it's an inexpensive way to get triple display support.
"...Conclusion: Reasonable price, works reliably for systems requiring an "Active" adapter, quality construction, and relatively small size...." Read more
"...Very nice. Very much worth the money." Read more
"...Has to be an active DisplayPort also, can't run a passive one. Price was great, worked fine after hooking up and some adjustment to the..." Read more
"...to get anything over two monitors to work, but at least it's inexpensive and easy to do...." Read more
Customers appreciate the adapter's ability to support multiple displays, including third monitors with Radeon 7850 graphics card and Eyefinity technology.
"...HDMI Adapter is also a very useful device - as is the Active Mini DisplayPort to DVI Adapter. Both make studio work very easy!" Read more
"...This is an active adapter which is ideal when connecting several monitors but this is useless in my case since I only have one external 27"..." Read more
"Because of this adapter I can have an additional screen set up with my laptop, allowing me to upgrade from the 17" laptop screen to a 24"..." Read more
"...Games, Movies, and split screen for daily office work are exceptional...." Read more
Customers have mixed experiences with the adapter's 4K support: while some report successful operation at 2560 x 1440 60Hz, others mention it fails to achieve 60Hz at 4K resolution.
"...Surface pro 6: it connects fine at 60HZ 4K. - Mac mini late 2012: it connects at 30HZ 4k using switchresX and some tweaks. -..." Read more
"...The problem is that typical PASSIVE DP to HDMI adapers do not output the full resolution, only ACTIVE adapters will...." Read more
"...Regardless, it worked perfectly! Full 4K@60Hz!..." Read more
"...Worked great, full 4K from 2012 Mac Mini. Realized that my receiver didn’t support 4K so I shelved the connector until I had my HDMI audio/video..." Read more
Customers have mixed opinions about the adapter's build quality, with some finding it well made and reliable, while others report that it wears out after a few months of use.
"...reliably for systems requiring an "Active" adapter, quality construction, and relatively small size. I definitely recommend this adapter." Read more
"This one is working great. Even on crappy design of surface SP3 pro, it still output 3840x2160 on my Sony 65" 850c without dropping out frames...." Read more
"...know what happens then... All problems aside, this adapter seems pretty solid and well made hence my 2 stars...." Read more
"...Simple, solid product if you want to keep using your old trusty Mac Mini." Read more
Customers have mixed experiences with the adapter's connection strength, with some reporting it works perfectly with Surface Pro 4 and Eyefinity setup, while others mention issues with loose connections.
"...Then the real issues started coming up. The unplugging and plugging became more frequent...." Read more
"...This Cable Matters adapter worked immediately, and I now have full 2560x1080 resolution. Recommended." Read more
"...Absolutely no signal. Of course I can’t return it. What a piece of junk! = Update 6/2/19 =..." Read more
"...Mac Mini never did when connected through HDMI. Was only 1920x1080 which looked like 4:3 on an 16:9 TV...." Read more
Reviews with images

Plug-N-Play! Brought my 2560x1080 Ultra-wide Monitor to Life!
Top reviews from the United States
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- Reviewed in the United States on August 11, 2019This story is about a boy. A young man who lost his innocence; his dignity shattered after falling victim to an evil scheme perpetrated by one of the largest manufacturers of incompetence in the world: Microsoft.
This is not a sad story. Nay, 'tis a happy one. For the boy grew older and wiser, and with the help of the great heroes at Cable Matters, was able to triumph over the fiendish plot by the corrupt company-that-must-not-be-named to siphon away his money.
I am that boy. This is my story.
Some time ago, I decided that I would like to upgrade my home office setup to have dual monitors. I have a dual-monitor setup at work, and had gotten spoiled by the amount of multi-tasking I was able to accomplish. When the idea first came to me, I instantly became giddy as a schoolgirl; grinning ear-to-ear from the speed and efficiency which I would be able to meme, lurk on reddit, melt my brain with more dumb videos, get lost in a 5-hour rabbit hole of wikipedia links...you know. Standard responsible adult stuff.
I ventured to the Land of Best Buy, where I set out to find a docking station and a set of monitors for my Surface Book (original). I managed to settle on the Surface Dock 2, and a set of HP 25es monitors (which were on sale at the time, and had decent reviews).
Since the monitors are a little older and on the lower-end of the budget spectrum, they did not come with HDMI to MiniDisplayPort cables. Just the standard, ubiquitous dual-ended HDMI cables. It became clear that unless I wanted to go back to the drawing board, I had to find a pair of MiniDisplayPort to HDMI adapters, so the monitors could be hooked up to the Surface Dock.
In my naive thinking, I assumed that purchasing a set of Microsoft's MiniDisplayPort to HDMI adapters ($40 each, by the way) should have zero issues working for my setup. After all, everything would be from Microsoft! Of course things should play nicely together.
WRONG. DEAD WRONG.
At first, everything seemed to be working just fine. No real issues with any part of the setup. After a couple months, things started getting weird. A monitor would occasionally shut off randomly, or wouldn't wake up after the computer went to sleep, etc. I got by for another couple months by just unplugging the "dead" monitor's MiniDisplayPort adapter from the Surface Dock, then plugging it back in. Not too bad.
Then the real issues started coming up. The unplugging and plugging became more frequent. It became necessary to unplug and plug several times just to make things work. After a while, it was almost a certainty that one of the monitors would not be detected after I woke up my computer, or it would be incorrectly detected as some "Digital Flat Panel (640x480 60Hz)" screen.
"This clearly must be some sort of bug that was accidentally introduced in one of the Windows updates" I thought to myself. If only I had known the depth and extent of my ignorance...
I spent hours upon hours researching the various drivers associated with my Intel 520 graphics card, the dedicated Nvidia GPU, the monitors, and eventually my entire hardware setup just to ensure that everything had been updated. I checked for anything new on Windows Update daily. I even downloaded the latest Windows ISO images for my Surface Book after each major Windows update, in a paranoid attempt to make sure my drivers, software, and firmware were on the absolute bleeding edge of technology available to my setup.
I realized that I had truly started to creep into the fringes of insanity when I found myself doing all sorts of voodoo computer magic. I started plugging the monitors into the dock one at a time, very slowly, over and over again until it would detect both. I stood the dock up vertically. I flipped the dock connector around on my computer. I basically lobotomized the keys in my registry related to my graphics drivers and monitors. I would then proceed to try all sorts of various combinations of these things until finally I could use both monitors.
This death spiral continued for months. Why was this happening to me? Did I offend the deity of Connectivity? Is this karma punishing me for some past transgression? WHY GOD? WHY?
This madness came to an apex a few days ago, when I caught myself spending 6 hours...six. SIX. Six whole hours just trying to get the damn thing to work. I couldn't take it anymore. After torturous hours of shameful, single-monitored googling, I finally found the source of my agony.
Microsoft was recommending that MiniDisplayPort to HDMI adapters should be "active" if using both MiniDisplayPort slots on the Surface Dock. The Microsoft ones I had purchased, the only adapters they made at that time, were passive.
Level of betrayal: Egregious.
I purchased these adapters from Cable Matters, and now have my setup working flawlessly again. Crystal clear, work just as expected, and got both of them for $36 (as opposed to shelling out $80+ for a set of Microsoft's NEW adapters V2.0, which are active, but only got released after they realized how royally they screwed up in the first place). And lived happily ever after.
That day, the Day of the Second Docking, the boy realized he was no longer a boy. He had become a man. He was now wise to the ways of the wicked: a glittery, inviting exterior, hiding seven layers of Hell underneath.
My reasons for telling you this tale are twofold: Heed the warnings from this lesson, lest ye succumb to the black magics of the Brand, and Praise Be to the great folks at Cable Matters for extending their heavenly hands to pull me from my pit of misery.
Cable Matters, you are my Rick Astley. Thank you.
TL;DR: buy this adapter. it works.
- Reviewed in the United States on November 27, 2024Writing this specifically for those trying to use an older Mac with an ultrawide monitor. In my case, 2011 Mac Mini, and LG 25UM58 monitor (2560x1080 resolution). This monitor has only 2 HDMI ports, and the Mac Mini outputs 1920x1080 over HDMI natively. However, the Mac Mini has a mini DisplayPort, which can output the full 2560x1080. The problem is that typical PASSIVE DP to HDMI adapers do not output the full resolution, only ACTIVE adapters will. I already tried the IVANKY active adapter, did not work, no image output at all. This Cable Matters adapter worked immediately, and I now have full 2560x1080 resolution. Recommended.
- Reviewed in the United States on December 29, 2015Pros:
- "Active" instead of passive (means that it actually pushes the signal to your monitor)
- Good quality and construction
- Relatively small size
Cons:
- none at the moment
Personal Experience:
I have a Microsoft Surface Pro 3 and purchased the docking station to create a home system that would work will a full-sized monitor. Without research, I assumed that any minidisplay port to HDMI would work fine to allow the Surface Pro 3 to mirror or display its screen on my full-sized monitor. Unfortunately, this was not the case and after a few days of frustrating inconsistency trying to mirror my display on my monitor, I did some research to diagnose the problem. The problem was simply that lower-cost minidisplay to HDMI adapters tend to be passive (which isn't a problem if your device actively pushes the signal, but the Surface Pro 3 does not actively push the signal), thus causing inconsistent or inefficient transfer of the necessary signal to push your display to a full-sized monitor. After doing a little more research, I found the Cable Matters adapter and was pleased to discover that it worked perfectly. I purchased two so I could always have one at home, and one for when I travel to plug directly into any TV.
FYI: Some older HDMI cables may not be compatible with an "active" adapter. I tested this out by using an older HDMI cable in my Surface Pro 3 to full-sized monitor set up, and I ran into the same problems I had originally with my "passive" adapter. This is likely because the older HDMI cables aren't able to transfer the active signal to the monitor (thus negating the "active" signal and making your setup "passive" again). I swapped out the older HDMI cable for a newer one, and it worked perfectly again.
Conclusion:
Reasonable price, works reliably for systems requiring an "Active" adapter, quality construction, and relatively small size. I definitely recommend this adapter.
- Reviewed in the United States on November 6, 2019I got this to drive a 2560x1440 resolution monitor on the Thunderbolt port on a 2012 Mac Mini. At first, it did not work. The monitor had no signal, no blip, nada. My other monitor switched and showed that the desktop moved to the monitor connected to the Thunderbolt port, but that monitor did not show anything. It was just black.
After some research I discovered that you have to connect the adapter and the monitor and then restart the Mac. I did this and voila! It works. If you're having trouble getting this to work on an older mac, do a restart.
On my 2015 MacBook pro it worked without problems or without need to restart.
Top reviews from other countries
- HamonReviewed in France on August 13, 2024
5.0 out of 5 stars 2160P + 60 FPS
Triste resolution works on windows 10 x64 22H2!! Great cable.
- James PrallReviewed in Canada on June 16, 2023
5.0 out of 5 stars Active adapter gets 2K video from TB2 on 2012 Mac Mini
I bought a 2K flat panel with both USB-c and mini-HDMI inputs. It works great with USB-c video, but I wanted to use it with my old late-2012 Mac Mini. The max video resolution of the Mini is 2K, but only through the Thunderbolt 2 port (also called "mini DisplayPort" in the non-Apple world).
To use the mini-HDMI input of the panel, I needed:
an ultra-res mini-HDMI to standard HDMI cable
* an adapter from TB2 to standard HDMI
The first adapter I bought was 'passive' and thus only passed standard HD video.
This replacement adapter is 'active' which allows it to pass full 2K resolution from the Mini's TB2 port to the HDMI cable and thence to the panel. It worked out of the box.
I can use this on the music rest of my digital piano, showing PDFs of sheet music at nice crisp resolution.
-
Amazon CustomerReviewed in Japan on December 19, 2023
5.0 out of 5 stars Macmini Late2012で3K(2560x1440 60Hz)出力できました。
この手の変換ケーブルにて2560x1440 60Hzができるものを探していました。うちにあるiMac2009 24inchは中身を抜いてコントローラーを入れたものなのですが、3K 60Hzしか受け付けてくれません。無事Macmini Late2012にて動作してやっとフル機能が使えます。
- AkkshayReviewed in India on January 15, 2017
1.0 out of 5 stars One Star
Item is not a Active adapter as advertised, it only outputs at 30Hrtz
- Mark CullenReviewed in the United Kingdom on March 6, 2020
5.0 out of 5 stars 2560x1440 144Hz works fine
I have, I think, a bit of an unusual set up so I'll explain that first and why I ended up buying this adaptor.
My home PC has an RTX 2080, which only has a single HDMI port and many full size DP ports. The HDMI port is taken up by an Oculus Rift, and I was running an old 24" 1920x1200 60Hz monitor using an Amazon Basics DP to HDMI adaptor and an Amazon Basics 10m HDMI cable, as my PC is actually in the living room so I have more space for VR.
This was all working fine... until I upgraded to a 32" 2560x1440 144Hz monitor a few months ago, where the Amazon adaptor just wouldn't work at any more than 1920x1200 60Hz, so I had to use the HDMI port instead and keep swapping cables whenever I wanted to use the Rift. The HDMI port was working fine, so it must have been something to do with the Amazon adaptor. That's now solved with a fibre DisplayPort cable, and also means I can have a dual monitor set up with my old monitor back on the Amazon adaptor and 10m HDMI cable... not that I really need it on my home PC...
What has any of this got to do with a mini DP to HDMI adaptor? Well, I work from home half of the time and having two monitors is actually rather useful there. My work laptop has an HDMI 1.4 (I think) port and Mini DP port. There are plenty out of mini DP to HDMI adaptors out there, but most state a max resolution of somewhere around 1920x1200 60Hz, which appears to match my experience with the full size DP adaptor that I am using on for my home PC. I took a punt on this one as it states that it supports 4K at 60Hz, and I can happily confirm that it's working fine at 2560x1440 144Hz!
There is a review claiming that this is not an active cable. I honestly have no idea if it is or isn't, but it's working fine for me. I don't think the Amazon Basics full size DP one stated the HDMI version or whether it was passive or active, so it could just be as simple as this one is HDMI 2.0 whereas the Amazon one is only 1.4, and nothing to do with passive vs active? No clue, but I'm happy!