thunderbolt throughput?

[Ploki]

I'm having trouble understanding this still...

One port is 2 x 10Gbit, does that mean 10Gbit for input, 10Gbit for output?
Or does 2x 10Gbit means 2x full duplex equaling in 2x10gbit downstream + 2x10gbit upstream per TB port. (Paired per channel of course)

As I understand some bandwidth is also reserved for DP?

 

[scenox]

When connected to a Thunderbolt device the per-lane data rate is 10 Gbit/s and the 4 Thunderbolt lanes are configured as 2 duplex lanes, each 10 Gbit/s comprising one lane of input and one lane of output.

When connected to a DP device the Thunderbolt port can provide a native DP signal with 4 DP lanes of output data at no more than 5.4 Gbit/s per Thunderbolt lane.

Does this answer your question?

 

[Ploki]

Mostly.

It's 10gbit per channels, which means if you have equal load for i/o you get 5gbit per one channel or total 20gbit per port?

any way of combining one device over both channels?

Are the channels limited or is the bandwidth distributed as needed?

How come that DP takes up so much bandwidth.

Is the HDMI output on the retina shared with TB ports?