I have a Gigabyte 970A-DS3 (rev 3) MB with 2 USB 3.0 ports on the board itself (rear) but only 2.0 headers inside. Can I add a pci-e card with a 19 pin connector for my 2 front case 3.0 connectors or will this cause a conflict. MB uses Etron controller. I have been searching a long time, so now I'll ask for help.