HDDs that are advertised as SATA 6Gb/s can only transfer the contents of their cache buffer (8MB or 16MB or 32MB or 64MB) at SATA 6Gb/s speeds.
No HDD can spin fast enough to Read or Write at SATA 6Gb/s speeds.
Oh! Well then won't I notice a difference? I guess if I wasn't using my SSD for browsing, games etc then I would. But if I store movies etc on the HD, will I notice a performance difference in opening files etc. I imagine not.