Mate I dont use sata but am informed that only 3 and 4 are locked for o/c ing the max vcore will depend on your bios I have the modded 1.3b6 bios in mine max vcore is 1.9v you can use the ocz booster but I cant remember which slot I had mine in
Heres a really good thread at xtreme systems containing the collective results of peoples experiences with this board, it has all the answers to your questions and more;