If you have more than just the target OS drive connected to the PC when you install Windows 7, it will likely put the MBR on one of the other drives. If you then remove the other drive, or it is formatted when creating a RAID volume, the MBR will be lost and the PC will not boot. Just have the SSD connected when you install Windows.
Are you planning on installing the "F6" basic Intel RAID driver during the Windows installation? That is not supposed to be required, but I always do so and have never had any issues. Either way, you must install the full Intel RAID driver package (IRST)after Windows is installed. Once that is done, you can configure the RAID 1 volume in the IRST Windows UI, or in the Ctrl i RAID Option ROM during POST.