I wouldn't worry about it, unless you are planning on spending big bucks on an SSD in the foreseeable future... It will be a long time (think - years, not months) before physical hard drives will be able to take advantage (other than caching, of course) of the SATA3 bandwidth; there are - count 'em, exactly two
SATA3 SSDs that could
take advantage of it, from Crucial
, but they don't seem to have their firmware 'together' yet; and ,so far as I know, the Marvell SATA3 ports are unable to handle TRIM in RAIDs. When you see Intel using SATA3 in an ICH, then it'll be time to think seriously about SATA3!