We just got word from Intel that it has new Rapid Storage Technology (RST) drivers available for download, and there's a good reason why you might want to check them out. As we've been told, version 10.1 adds support for hard drives larger than 2TB in AHCI mode.
That's good news, though it isn't a cure-all for the so-called 2TB barrier. Even with the updated drivers, you'll still need a 64-bit OS and a motherboard sporting one of those fancy UEFI BIOSes that support booting to a GPT partition. Failing these requirements, you're still limited to using these drives as secondary storage.
Intel also said it's planning to add RAID mode support for these large capacity hard drives in a future release.