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What cable do I need for that? I've seen different things in different places, never specifically for the 2017 iMac with the following specs:

  • 2017 27" iMac Retina 5K
  • 24GB RAM
  • Radeon Pro 580 8GB
  • macOS Catalina 10.15.4
Allan
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pitosalas
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1 Answers1

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You need a Thunderbolt 3 to HDMI converter. Your iMac has two Thunderbolt 3 (with the USB-C form factor). This converter is available from Apple. Make sure to buy the Thunderbolt3 to HDMI converter, and not Thunderbolt-2 to HDMI, as Thunderbolt3 uses USB-C, and Thunderbolt2 uses miniDisplayPort

My source for the information about your iMac: EveryMac.com - Apple iMac 27-Inch "Core i5" 3.8 (5K, Mid-2017) Specs

You should be able to get 4k output if your television is capable of that resolution (3840x2160). In other words, you will get no higher than your television's resolution.

Allan
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Matthew Barclay
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    Good answer, +1. However, I wouldn't recommend the Apple adapter because it's passive.. For best results when going from DisplayPort (the video out of a Thunderbolt port) to HDMI is to use an active HDMI adapter because those signals are very different and you will likely encounter issues going between the two. – Allan Apr 28 '20 at 14:11