everyime I plug into the usb3 card I loose wifi connection on m wifi card until I disconnect the usb connection. I was hoping plugging in a hub to the furthest port would work but it didn't. I have a geforce gtx680 in the lowest pic port which is a double port and the card requires a double port above it is the wifi card above that is my usb3 card and in the top spot is my data pic card with two 1 tb wd blue drives which requires the top slot or the bottom but the gnu is there so that leaves the two inner port for the wifi and usb3. my only option seems to be one of the pic exterior port extenders if you can go pic to it because no thunderbolt on a 5,1 Mac Pro. anyone else run in to this and solve it since I would hate to loose usb3 and can't do without the wifi.