I have a question regarding the Sharkoon VG4-W blue case I recently bought. On the problem section of the case i read that you should only connect the USB 3.0 19 pin connector to the motherboard, but the connector cable also has a usb 2.0 connector. The front of the case has 2 usb 2.0 ports and 2 usb 3.0 ports. Does the 19 pin connector support all 4 ports? Even if two of them are usb 2.0 and the other two 3.0? Or will the other two usb 2.0 ports be useless? Thanks.