Your board has more than two SATA ports. It has two SATA 6GB/s ports, but it should have several SATA 3GB/s ports too in addition to the two 6GB/s ports your board has. You can plug your hard drive and optical drive (that's your DVD drive) into the 3GB/s ports and keep your SSD plugged into one of the 6GB/s ports.
The white ports are 6GB/s and are for your SSD, and the black ones are 3GB/s and are for optical drives and hard drives.
There's no need to buy any extra cards if your board already has the ports you need.