The new VelociRaptors? Well WD claimed that it was the world's fastest SATA drive, which I think is true as Seagate doesn't have a product in the same class - there's the Seagate Barracuda at 7.2k rpm and then the Cheetah at 15k rpm. No 10k rpm SATA drives from Seagate, only UltraSCSI.
Here's the spec for the Raptor: Link
C. P. U. Its not a big processor... Its a series of pipes!