Now many computer tower case come with usb 3.0 port on front, if your mainboard has no usb 3.0 female header, how can you do?
The usb 3.0 internal female to usb 2.0 header cable can help to transfer from usb 3.0 to usb 2.0 mainboard header, at least help front port working at usb 2.0 speed temperately.
