Yes , for USB2 if they are of good quality but if not it could make some problems with how the devices connected to it is recognized. Some extensions made for USB1.1 do that but it's only a problem if they are of low quality and not properly shielded to handle USB2 speeds. Keep in mind too that power rating of 5v dc on USB2 is only per header on the board, not at user side, so you can't just keep adding them. If more power is needed use powered hubs outside. You can use a , let's say, a mouse and a keyboard on that cloned dual connector but not a scanner and portable HDD or something else that takes power from a USB port. Each header on the MB is limited 500mA usually but on Gigabyte "Ultra Durable" MBs is higher.
Edited by MishelLngelo - 6/13/13 at 11:52am