I have the same mobo and have been able to create a RAID 0 array under Win 7 64 bit. I did so by installing Intel Rapid Storage Technology drivers / application version 9.5. I created the RAID 0 volume from within Windows by using the Intel application. If you create the volume this way you do not need to create it through the bios. You should have the SATA controller set to AHCI or RAID type.
I would note I cannot currently locate version 9.5 of RST on Intel's site and instead had to grab it from www.station-drivers.com (see this thread -> http://communities.intel.com/thread/9203;jsessionid=642155A282CD401B80BD235FBE73D6AC.node5COMS)