Isn't the specs for the SATA on Intel's ICH5 and ICH5R
• The individual channels can support Serial ATA transfers up to 1.5 Gb/s (150 MB/s)
• Point-to-point connection topology ensures dedicated 150 MB/s per device
• In addition to the features of ICH5, the ICH5R I/O controller hub includes an integrated RAID controller that utilizes the dual Serial ATA ports for a high-performance RAID Level 0 configuration with a maximum theoretical transfer rate of 300 MB/s. By integrating the Intel RAID controller into the I/O controller hub, there are no PCI bandwidth limitations (133 MB/s) nor any loss of PCI resources (request/grant pair, PCI slot) that would typically occur with discrete PCI RAID solutions.
So when you run on SATA, the HD will already operate at these "theoretical" speeds?