Enable AHCI. AHCI mode enables some of the advanced features of SATA such as NCQ, RAID, and hot-swapping.
For you, the immediate benefit is Native Command Queuing (NCQ). It allows the drive to queue up to 32 commands to optimize the order they are read from the disc because of physical location on the platters.
The ICH8R controller on your board can migrate your current drive to a RAID array later if you decide you want the redundancy.
Hot-swapping will allow you to replace a failed drive or even add a new drive without even rebooting the computer!
There are probably other benefits not coming to mind right now.
If you already have Windows installed, when you change it to AHCI, Windows will probably blue-screen when you boot with a Stop 7B error. That's because it will need the proper drivers for the AHCI mode. You can obtain the latest ICH8R drivers from Intel's website. You will also need the Matrix Storage Manager if you wish to use RAID.
Ryan