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A comment on Linux on the Mac – state of the union. Parent comment

Re:Linux on the Mac – state of the union by TazeTSchnitzel on Monday December 12, 2016 @11:34AM (#13159326)
There's 4 40Gbit/s ports, but their total bandwidth is not 160Gbit/s. IIRC, the ports on the right side of the machine have less total bandwidth because of how they're connected, for example.
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Re:Linux on the Mac – state of the union by l1k on Monday December 12, 2016 @11:51AM (#13159486)
That is correct. The Thunderbolt controller has two DisplayPort sink ports which are wired to the GPU, in addition to the PCIe 3.0 4x interface which goes to a root port in the CPU. So to actually max out the 40 Gbit/s, you need to drive external displays and also max out the PCIe 3.0 4x interface. Which is another way to say that 8 Gbit/s are reserved for DisplayPort.
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