OK. That motherboard has:
6 x SATA 3Gb/s connectors (SATA2_0, SATA2_1, SATA2_2, SATA2_3, SATA2_4, SATA2_5) supporting up to 6 SATA 3Gb/s devices
Support for SATA RAID 0, RAID 1, RAID 5, and RAID 10
GIGABYTE SATA2 chip:
1 x IDE connector supporting ATA-133/100/66/33 and up to 2 IDE devices
2x SATA 3Gb/s connectors (GSATA2_0, GSATA2_1) supporting up to 2 SATA 3Gb/s devices
Support for SATA RAID 0, RAID 1 and JBOD
iTE IT8720 chip:
1 x floppy disk drive connector supporting up to 1 floppy disk drive
All the SATA ports are SATA 2 (3 GB/s). The good news is that you can connect an SATA 2 port to an SATA 3 drive, or an SATA 3 port to an SATA 2 drive. You just get the lower SATA 2 speed. They are 101% compatible.
You can run RAID 0 or 1 on your Green drives as long as they are on the same controller. You can run another drive on the same mobo by the simple expedient of not
adding it to the RAID set. In fact, in addition to your RAID you could run six more SATA drives and two IDE drives (if you collect antiques, that is).