I assume you will use the SSD for the OS (rather than for shoving large amounts of big block data around). In that case, it will really make very, very little difference whether you have a Sata2 or Sata3 SSD or port.
The OS performs so well because of the extremely short access times of the SSDs. As far as data is concerned, it does not move large masses around and that mostely in 4K blocks (which is nowhere near the advertised speeds).
The rest is for measurements and bragging purposes without little practical consequences. Too bad you wasted $20.