So I'm building a new computer, and I just ordered 3x120gb Cherryville SSDs. I want to put them into a RAID 0 array, but I only know how to do that with an OS (Windows 7). Can you make an array in BIOS?
You can, and need to setup the RAID bios configuration by hitting F6 upon posting, and select RAID 0 and select the disks. Then install the Intel RST driver after the OS install of Windows 7.
The issue that you may have is that 3 disk RAID using the 6Gb/s ports will not be optimum as you will have to use one of the Marvell ports along with the two Intel -- the Marvell is about 11% slower than the Intel from the benchmarks that I have seen.
If you really want to do RAID 0, use two disks on the Intel ports and then make the third SSD a non-raided separate drive on a Marvell port.