Lenovo X1 Carbon 6th Generation Thunderbolt

modeonoff

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Jul 16, 2017
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Hello, I recall reading a review about this new laptop. The reviewer mentioned that there are two Thunderbolt ports and if one is used, the bandwidth of the other drop. Is it really true? How come?
 
Apr 21, 2018
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It depends on how much bandwidth each is using. There is a set amount of data each one can transfer, however the interface between the motherboard and ports is less than the sum of the max data transfer of the ports. As a result, when transferring more data than the motherboard interface, the data transfer rate in lowered so as not to exceed the interface bandwidth limit. So yes, one, or both of the ports, can be bottle necked if they are both transferring data at the same time (as almost max saturation).
 

modeonoff

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Jul 16, 2017
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Thanks. Is this common? If I connect one of the two Thunderbolt ports to a Thunderbolt 3 dock and then an eGPU from the dock, will each device get full performance? Is this way better than direction connection from the laptop's first Thunderbolt port to eGPU and the 2nd Thunderbolt port to Thunderbolt 3 (to access USB drives and 4K monitor at 60Hz)?
 
Apr 21, 2018
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Use one Thunderbolt Port into the eGPU, as this will fully saturate the connection bandwidth. This will mean less bandwidth for the dock (monitor and storage) as there will be less bandwidth. If you plan on using an eGPU, get a laptop that isn't limited by output bandwidth, as by the sound of it you are going to need all the bandwidth you can get!
 

modeonoff

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Jul 16, 2017
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Thanks. How can I tell if a laptop isn't limited by output bandwidth? I don't think manufacturers mention that explicitly just like they put HDMI without saying that it is HDMI 1.4.

Know any good laptops that has no such limitation?
 
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