Does this adapter support 60 Hz for a 4k UHD screen?

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    Yes, but only for Thunderbolt displays or Thunderbolt display adapters, as this adapter does not pass DisplayPort or HDMI signals, according to the document HT207266 "Connect devices and displays with the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter" on Apple's support website.

    The LG UltraFine 5K Display is a Thunderbolt display, and does allow 4K @ 60 Hz on some Thunderbolt 2 Macs using this adapter, according to the document HT207448 "Use the LG UltraFine 5K Display with your Mac" on Apple's support website.

    I do have a Thunderbolt 3 to Dual DisplayPort adapter which allows two 4K @ 60 Hz displays to be connected using the Thunderbolt Display protocol.

    I'm running macOS Sierra on a MacBook Pro (Mid 2015). I installed a Thunderbolt 3 enabler patch so that I could connect an AKiTiO Thunder3 Duo Pro using the "Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter". The AKiTiO has a second Thunderbolt 3 port where I connected the Dual DisplayPort adapter. I was able to connect a 4K @ 60 Hz display to the Dual DisplayPort adapter.

    The Dual DisplayPort adapter when connected in this way to the MacBook Pro (Mid 2015) allowed only one display when it was set to 4K @ 60 Hz. The adapter allowed two displays at 2560 x 1600 @ 60 Hz.

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