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Hello ctzny,Welcome to Community@ Rocketfish™!We'll be happy to look into this concern if you'll please reply with your product model number!Regards,JustinRocketfish™ Support
The model number is RF-P2USB3.
It is this item http://www.rocketfishproducts.com/products/computer-accessories/RF-P2USB3.html
The 4 pin power cable is required for this card to operate properly.