Well..
The max most mobos will let you set your RAM to is 2.8v. I wouldnt recommend going over that anyhow. As for FSB, I usually go up 5mhz at a time and let it boot into windows and then run a game for a bit to test stability, if its there, then go up another 5, until its unstable then go back 1, test stability, if its still not the go back another 1.. until it becomes stable again, and theres your overclock. Also, dont forget to bump your cpu voltage now and then.