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How can the old 27-inch 5K iMac be used as a monitor for other devices? Runs at full 5K @ Anonymous184 with low enough delay

by Poster Mar 21, 2024 21
There are several replaced 27 '5K iMac 2020 in the company. The processor is Intel 8th generation or 10th generation i5. It is relatively slow to run the current macOS, but this 5K screen is still very cool. I am wondering how to use it to other devices (such as 24' 4.5 K M3 iMac) as an external monitor, the methods I have tried or found so far are not good enough 1. Use Apple's official AirPlay Server (which can be turned on in System Settings-General-AirDrop and Relay), the delay is visible to the naked eye, and when the iMac connected to the keyboard and mouse used for screen projection moves, it will exit as soon as there is an action 2. Connect the output of the source device through the video capture card, and then use the playback software to display the signal of the video capture card on the iMac used for screen projection. After searching for the capture cards sold online, most of them can only input the specifications of 4K @ Anonymous184, which is still a waste of the iMac's 27-inch 5K screen. Searching on Google in English, many people recommend Luna Display, an integrated software and hardware solution. Looking at his official website, mac-to-mac can only reach up to 5K @ Anonymous3190, and the delay is unknown Finally, I complained about Apple's various restrictions. With such a good screen and a set of software and hardware, it can be used as an output device. The current Studio Display and XDR Display seem to have chips running out of the system, but since iMac 2014, the Target Display Mode was cancelled to cut off the possibility of direct connection to the video output cable

Replies

  • Anonymous358 Mar 21, 2024
    The 8th and 10th generation CPUs are okay, but the lag is probably fused hard disk garbage. It is recommended to switch to SSD and it should last another 5 years
  • Anonymous3191 Mar 21, 2024
    Add memory sticks and replace ssd. I'm still using a 2015 iMac eh.
  • Anonymous3192 Mar 21, 2024
    https://post.smzdm.com/p/akk5wzv4/ If you have a Thunderbolt 4 data cable, you can try it
  • Anonymous3193 Mar 21, 2024
    Taobao has modified it before, so you should add your own driver board
  • Anonymous3194 Mar 21, 2024
    Remove it and add the driver version. Want to run 5k 60 and want no delay, this is the only way 4k 60 is much simpler, just AirPlay
  • Anonymous2330 Mar 21, 2024
    The system is installed on an external hard drive, and the memory is full, which is enough
  • Poster Mar 21, 2024
    @ Anonymous358 # 1 @ Anonymous3191 # 2 The hard disk is already an SSD, and the memory has been expanded from the factory 2x4G to 2x4G + 2x8G, a total of 24G memory Whether it is stuck or not depends on the application scenario. Our iMac comes with a 5K plug-in and a 4K screen. It is not possible to run video processing and AI rendering, but it should be ok for ordinary office work
  • Poster Mar 21, 2024
    @ Anonymous3192 # 3 I doubt whether this main post is really effective in practice, because the Apple official website he screenshot said that iMacs after 2014 (that is, all iMacs equipped with Retina screens) do not support the Target Display Mode, which is the last complaint of my main post. The Target Display Mode, and a bunch of people in the comments said that it didn't work after trying it
  • Anonymous3195 Mar 21, 2024
    Just plug the Thunderbolt 3 or Thunderbolt 4 cable directly, and then press Command F2
  • Poster Mar 21, 2024
    @ Anonymous3195 # 9 Can it be confirmed that it is directly feasible? Looking at Apple's official documentation, there are several prerequisites for plugging in the Thunderbolt wire directly and then Cmd+F2 1. The iMac used for monitor mode needs to be a pre-2014 model and run High Sierra or earlier macOS 2. The device used as output needs to be a model before 2019 and run Catalina or earlier version of macOS https://support.apple.com/zh-cn/105126
  • Anonymous11108 Mar 21, 2024
    1. This version of iMac is not supported as an external monitor. 2. Normal office programming doesn't get stuck, so I use the same model. I upgraded the memory to 96GB, attached a 4TB SSD to the hard drive, and then attached an external 4K monitor. There are three windows virtual machines running on one machine, 50 + containers. Not stuck either
  • Anonymous11108 Mar 21, 2024
    The machine supports a maximum of 128GB RAM. Large memory is really cool.
  • Anonymous2691 Mar 21, 2024
    There is also this demand. Want to use the performance of MacBook Pro and the big screen of iMac... But so far there is no way to coexist..
  • Anonymous3195 Mar 21, 2024
    @ Poster # 10 You will know if you try it
  • Anonymous3196 Mar 21, 2024
    The 5K version of iMac is no longer supported as an external display.
  • Anonymous3197 Mar 21, 2024
    Throw it at the front desk and use it as an executive machine, too lazy to toss
  • Poster Mar 22, 2024
    @ Anonymous3197 # 16 I have already placed one at the front desk, installed it through BootCamp and bought authorized Windows for front desk administrative use, and there are many 😂
  • Anonymous3198 Mar 22, 2024
    Luna Display I have used it, and it is better to update the system to macOS 13 (with OpenCore) and use the AirPlay screen to make it comfortable to use. All you need to do is plug in a network cable and configure local area network communication. If your iMac supports Thunderbolt 3, the effect will be better. Mine only has Thunderbolt 2. It's no big problem to use the scene to play the simulator, watch the web, and browse videos. If you pursue a no-delay solution, you can only disassemble the machine.
  • Anonymous2258 Sep 5, 2024
    @ Poster I would like to ask op, the iMac in 2020, now I buy it for office work, surf the Internet, and run apps that are less resource-intensive (video rendering, image processing, compilation, etc.), will it get stuck now? Below the macOS Sonoma system.
  • Poster Sep 6, 2024
    @ Anonymous2258 Sorry I can't answer this First, I wasn't using the equipment in my company before, and I didn't perceive the fluency or anything; Second, I don't use these replaced devices either. The only one I'm still using is putting them at the front desk and using BootCamp to install Windows for administrative staff. Their usage scenarios are quite different from your description, and there is no comparison; The third is the same 27 'iMac 2020, but the processor is different. The lowest is i5-10500B, and the highest should be i9-10900 or something. It is also divided into different model specifications such as memory and graphics card, which also affects performance