We had someone ask about the DP to HDMI 2.0 adapter and I was skeptical. So I got one.
And IT DOES WORK WITH MACS BEAUTIFULLY !
Even on a underpowered DP port from a 2014 Mini I was able to output 4K 60Hz HDMI to a 4K TV with HDMI 2.0 input.
No drivers, no settings, no nothing. Just plug it in and enjoy the 4K experience.
The one I got was from Micro Sata and was $30-40. There is also a hack I have been made aware of to enable higher pixel clocks, haven't tried that yet.
The fact that a simple adapter can produce these signals tells me that Apple has deliberately crippled certain setups and thus it is likely that the hack also works, or could.
Anyhow, I was even more amazed when I went to try the adapter on a MacBook Air. I was copying things to a TB drive and realized that the Air only had 1 @ TB/MDP port. But my Akitio chassis had a TB Daisy Chain port. I plugged it in there and had 4K 60Hz HDMI ! (While Restoring a PCIE SSD at same time)
Nice little product, might grab a couple dozen and stock them.