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This little gadget to find out which type of USB-C cable you have
(discuss.tchncs.de)
This is a most excellent place for technology news and articles.
From what I know, the chip in the cable is for active cables to get lengths of 2 meters plus, but comes at the cost of USB speeds when used for non-Thunderbolt applications. Shorter passive cables generally can hit 40gbps for TB and 20 gbps for USB.