In my XPS 15 (L521x), bought on Dec 2012, the HD capable of SATA3 transfers is working as a SATA2 drive: it's a Samsung 512 Mb SSD installed by Dell. OS is Windows 7 Ultimate x64. The BIOS is the latest version. The discovered transfer protocol, SATA2, doesn't change with or without intel Rapid Storage (currently not installed). The controller is set in the AHCI mode in the BIOS.
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