ASUS outs Thunderbolt EX4 PCI-Express3.0 (x4) ThunderBolt card

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Isn't 3.0 x 4 a bandwidth of 32Gbps? how does it support 2 port of 40Gbps each? What am i missing here?
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From ASUS' own site: "40 Gbps bi-directional bandwidth for superfast data transfers and video output" Not sure how "bi-directional bandwidth" relates to video OUTPUT....