I have an Asus P8Z77V mobo which of course has only one plug for USB 3.0. There are two 3.0s in the case and I have purchased a card reader which has two more 3.0s on it. My question is, rather than leaving two of them dead, is there a y adapter cable which will serve so that I may plug both of the connectors to the motherboard and will it degrade performance?