This is off your Manual........Chipset:
2 x SATA 6Gb/s connectors (SATA3_0, SATA3_1) supporting up to 2 SATA 6Gb/s devices
4 x SATA 3Gb/s connectors (SATA2_2~SATA2_5) supporting up to 4 SATA 3Gb/s devices
Support for SATA RAID 0, RAID 1, RAID 5, and RAID 10
* When a RAID set is built across the SATA 6Gb/s and SATA 3Gb/s channels, the system performance of the RAID set may vary depending on the devices being connected.
So possible....... but you will have problems I think in configuring......you will also have a 0 raid set with diminishing returns over the ICH10R SATA/chipset with 5 SSDs
Your best option , bang for buck would be to buy just one more SSD and put the rest towards a HighPoint RocketRaid 640 PCI-Ecard..........these cards are the first full 6Gb/s 4 port card that you can boot off as well......this combination should be cheaper to setup and give you better read and write speeds overall then going down the "Lets saturate the SATAs".......PCI-E you won't come near to saturating.
Aussie Allan