Expansion interface: 2 USB3.0 interface +1 19/20pin interface. 1 PCIE 1X to 2 USB3.0 interface +1 19/20pin interface expansion card. Use this product, it can install 2 USB3.0 interface +1 19/20pin interface in the PCIE X1/X2/X4/X8/X16 card slot.
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