I bought recently a new mobo which is gigabyte b75m-d3h and my psu is hec windmill pro 385.now i want to ask if there is a cable to enable the usb 3.0 or not .
USB 3.0 has nothing to do with your PSU. Your board has 2 Ports for USB3 on the back and 2 headers you can connect your case USB3 Ports to or buy a USB3 bracket for..
Unless you have a USB3 flash/harddrive, or some other special device USB3 is largely pointless anyway