You have to identify the exact chip set you have only ICH7MDH, ICH7M and the ICH7R/DH support Intel Matrix Storage. You have to press F2 to enter the BIOS.
Go to Gigabyt'es website you'll find out that it doesn't support Raid or AHCI, manual says
"Does not support RAID/AHCI (class code 0104/0106) hard disks."
"On a few motherboards based on Nvidia chipsets, BIOS update is required for Xpress Recovery2
to correctly identify RAID and SATA IDE mode. Please contact your motherboard manufacturer."