Asus Z8PH-D12 SE/QDR - Manual (Page 44)

2-26 Chapter 2: Hardware information
5. Intel ® ICH10R SATA port S/W RAID setting (3-pin RAID_SEL1)
This jumper allows you to select the Serial ATA RAID configuration utility to
use when you create disk arrays. Place the jumper caps on pins 1–2 if you
want to use the LSI Logic Embedded SATA RAID Setup Utility (default);
otherwise, place the jumper caps on pins 2–3 to use the Intel
® Matrix Storage
Manager (IMSM).