SATA 3 6Gb/s ssd's are backward compatible with motherboards that are only SATA 2 3Gb/s capable. There will be a bit of a perfomance hit but most of the time you will not notice it. The Vertex 3 will still be faster than a couple of Raptors in a RAID array. Go ahead and install your new ssd. In the meantime start saving for a new motherboard.