- Unless they make other chipset changes, a future Kaby Lake MBP probably won't be able to output HEVC main10 4K to a TV anyway due to it only having DisplayPort 1.2.
The verdict is still open on that one. There might be ways to push higher dp versions through the USB-C ports. USB-C itself is capable of handling DP 1.3 maybe there is a possibility to even get DP 1.4 through. Officially Thunderbolt 3 limits DP to 2 - 1.2 DPs, but given alternative modes etc... I am not sure if something higher is not possible if the internal hardware supports it. After all thunderbolt is more or less just an exposed pci express in port form.
If not then oh well, at least 4k/60 is possible at the moment via dp 1.2 and on hdmi via dp2hdmi converters (which some exist already). But I also do not see that changing unless a Thunderbolt 4 is in the pipeline.
The internal Radeon 460 GPU can handle DP 1.4 with HCP 2.2 and HDR just fine. Kaby Lake does not support HDR to my knowledge (I can be wrong however) it just adds a normal HEVC encoding engine, something the Radeon can handle by now. So I expect the biggest boost from Kaby Lake will be in th 13 inch models less so in the 15 inch models, which just might get a better frequence throttling compared to Skylake.
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My OCD is going crazy on those issues. The feeling of wanting a perfect machine that can do it all.
That is true on your side, as displayport wont be 1.4 for a while. Lastly, even 1080p videos might be encoded with h.265 HEVC in the future to save space and have better quality.
There never will be the perfect machine. Just one that fits your needs for the moment.
After all, we soon will get HDMI 2.1 and about 10 different variantions of HDR.
Add to that, that Apple has yet to move their retina screens to 4k or 5k (for whatever reason, given that 4k panels by now probably are cheaper than their custom resolution) and Intel is always late to support anything which comes from the Displayport and HDMI side of things.
As for the moment. The Retina Macbook pros can handle 4k just fine, it is just that you miss out on HDR and HDCP 2.2 (although the internal GPU can handle it). Not a big loss unless you want to use your mac as Netflix client connected to your tv and/or you have a hdr capable tv. But for both Tasks there are better suited devices on the market like an NVidia Shield.
And yes 4k over HDMI is also possible there are some adapters on the market which supposingly work (most if not all of them just being dp2hdmi converters)