[Krobar]

ually a feature provided by the CPU chip and not the chipset - except for the external LSPCON. This is also what the Intel HDR whitepaper seems to suggest:

I'm using a Supermicro X11SCA which works well with an HDMI 1.4 display using an HDMI 2.0 output port and the board uses the rarer Paradetech PS175 chip. If you take a look at the manual for the X11SCA the block diagram should confirm what are you thinking; the LSPCON connects directly to the CPU so the chipset is largely irrelevant (My board is using a C246 Xeon chipset). 

The PS175 claims  to support HDCP 1.4 and HDCP 2.3. No mention of 3D support but it seems to work well with the exception of a couple of right eye first 3D titles (If you could confirm if you can play right eye first MVC content or not that would be useful). From a list I saw a while back on Reddit it seems nearly all Intel boards with HDMI 2.0 ports use Megachips while Supermicro and Biostar seem to mainly use Paradetech. The Paradetech PS176 seems to be fairly common in the external dongles too.