As the TV only has HDMI 2.0 ports, I am considering to buy a thunderbolt to HDMI 2.0 adapter. but I want to know that whether this combination will give me the 60Hz refresh rate at 4k resolution.
MacBook – Can I use the MacBook Pro (Retina, 13-inch, Early 2015) with 4k (3840×2160) LG 40″ ub800t TV @ 60Hz refresh rate
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Related Solutions
According to Apple's MacBook Pro (Retina, 13-inch, Late 2013) - Technical Specifications...
So it looks like 1080p is the 60Hz limit.
Target Display Mode needs DisplayPort or Thunderbolt. It cannot use passive HDMI adapters or ones that don’t support active HDMI to DisplayPort.
- https://www.amazon.com/DisplayPort-Adapter-FOINNEX-Converter-Compatible/dp/B07G796JF8/
- https://www.amazon.com/StarTech-com-HDMI2DP-DisplayPort-Active-Converter/dp/B004I6IYSM/
Warning, that the apple link only lists DisplayPort in for some models of Mac. Be sure you can return anything you buy if you’re not sure it will work or have the seller or manufacturer confirm your specific Mac and use.
Source : Apple KB - Use your iMac as a display with Target Display Mode
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Best Answer
No, while the LG 40UB800T TV claims that it can run at up to 100Hz as a TV. It does so through internal interpolation which adds latency and is unsuitable as a computer display.
When you run this LG TV as a computer monitor you will only be able to get 30Hz out of it at full UHD (3840x2160) resolution across an HDMI cable. To drive the LG display at UHD@60Hz you need HDMI2.0 with HDCP2.2 support.
Apple does NOT support the HDMI2.0 or HDCP2.2 standard at this time. As of late 2015 the HDMI connector from ANY Mac will only drive a UHD display at 30Hz max according to Apple. To drive a UHD or true 4K (4096x2400) displays at 60Hz (with full color resolution) you MUST use DisplayPort with a monitor that supports 60Hz.