According to the specs, that system has two SATA 2 and two SATA 3 ports. Presuming a DVD-RW drive already is installed, that leaves 2 ports for a RAID 1. And there's no room for several additional hard disks. As 13thmonkey mentioned above, it makes no difference if a hard disk is connected to a SATA 2 or a SATA 3 port.
So I should be able to use the ssd as the primary os and boot drive and still do a raid 1 for the secondary drives?