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It's only x2 as far as I can tell - the northbridge has 18 lanes, the southbridge 16, and 16 from each of them are dedicated to one graphics card slot. But even x2 or x1 is a lot of bandwidth - 250 MB/s in both directions per lane! The Highpoint 2310 mentioned would be a good choice for you.
Why "sata II only"? What advantage do you imagine that would have?
I don't know. I just thought that SATAII drives should be attached to a SATAII controller, again I do not know much about hardware/dedicated RAID solutions, given that I have only used the nForce integrated solution up to this point.