IntelÂ® I/O Controller Hub (IntelÂ® ICH9/R/DH)
The IntelÂ® ICH9 I/O controller hub of the Intel P35 Express Chipset integrates several capabilities to provide flexibility
for connecting I/O devices.
â€¢ IntelÂ® Matrix Storage Technology3 (when configured with ICH9R I/O controller): Native support of external SATA*
ports (eSATA), combined with IntelÂ® Matrix Storage Technology (IntelÂ® MST), provides the flexibility to add an external drive for increased data storage with up to 6 times faster performance
than USB* 2.0 or Firewire* 400.4 Support for eSATA enables the full SATA interface speed of up to 3 Gb/s outside the chassis. The Advanced Host Controller Interface (AHCI) provides easier expandability with support for eSATA devices and native hot plug, while boosting boot and multi-tasking performance with Native Command Queuing (NCQ). In addition, support for Command Based Port Multipliers, and RAID levels 0, 1, 5, and 10 enable greater reliability for personal data, or maximum storage performance for intensive applications.
This is a PDF directly from intel. http://download.intel.com/products/chipsets/P35/317304.pdf Here is the link to that PDF. I am using AHCI on my XP 64 Corp // P35 chipset and it seems to be working pretty well for me so far. Have a good read, and good luck!