Sry ejn63. There are plenty of XP systems reported on the net running at SATA 3 speeds. I can quote you a few links, having done hours of research on this topic, but don't have patience to quote now. Did you know that many Corporates stuck to Windows XP even after release of Win 7 because the at 64 bit level, the performance was the same or better on XP ? Again, google will reveal this truth. The question at hand is different, and seems like not much interest on older systems from the support guys here in the forum.