This is according to Blackmagic Disc Test since AJA System Test isn't compatible with Lion. Sata2 - READ: 280MB/s WRITE: 290MB/s Sata3 - READ: 485MB/s WRITE: 495MB/s What a difference a Sata port makes! I have noticed a couple spinning beachballs since the upgrade when I had none before. I'll have to look into that more. Not sure if the 2 are related.