My SSD just arrived today it's Pioneer 128 GB SSD, let's get into the point, my pc only support SATA 2 interface, i know SSD are backward compatible and SSD are still worth on SATA 2, my question is R/W of a SSD will decrease when you fill it up but since my SSD is SATA 3 will the speed decrease but unseen because of my SATA 2 motherboard or will it decreased even further because of my SATA 2 motherboard? Thanks