want to take my q6600 to 333 fsb.

outside of disabling the eist and moving the fsb to 333. do i need to also take the memory to 1333? memory wise i have 4x1gb on the board, so i imagine that may also limit my over clock from what i have seen from other posts on this board and other mobos.

should i also leave the cpu voltage at default?

any suggestions or plan of action is greatly appreciated.