
5 inches (H) x 2.25 inches (W) x 4.5 inches (D) Weight. Not all iMacs with either port support Target Display mode - especially the new 4k and 5k iMacs - they don't support any video input so you would need a software screen sharing solution for them. Mode Dual HDMI 4K Docking Station with 100W PD Pass-Thru 110.99When purchased online In Stock Add to cart About this item Specifications Dimensions (Overall). Some iMacs support both thunderbolt as well as mini DP. I have no reason to doubt them - so be sure you can return a DP cable if you buy one for this. I used to believe all iMacs that support Target Display mode will take mini display port signal in - but some people report you need thunderbolt for some Macs. If you wanted thunderbolt - then you'd get Apple's Thunderbolt 3 to Thunderbolt 2 adapter - $30 on sale this month and use any standard thunderbolt cable. Displayport to miniDP adapter - $5 or so street price.USB-C to Displayport - $30 or so street price.There's probably no speed benefit of thunderbolt for this application.

I would probably go with a USB-C to MiniDisplayport and use the display port over USB-C protocol since that cable is less expensive than a thunderbolt adapter and would also work with a MacBook (non Pro and non Thunderbolt) or other USB only device. The new MacBook Pro can output to a Mini DisplayPort target display mode compatible Mac with either a cable that connects directly or an adapter to the existing cable you would have used with the Mac. Don't confuse a USB-C / Thunderbolt 3 port with USB only as the new MacBook Pro do have thunderbolt and not simply USB-C.
