You should look into doing the vdroop pencil mod. Very worth it and what you set will be what you get. Be careful about using auto though since it can set extremely high and unnecessary vcores. For instance, 8x400=3200 for me, my board would give me 1.6v. As for the board revision, don't worry about it. That was my mistake. I thought you had the regular p5b.

You wouldn't happen to know the week of your cpu would you?