Depends on the bios. You don't pick a number, there's a menu, a list of numbers that'll usually range from next to nothing pathetic to closer to 67 or better. If the menu goes up by 100MHz increments, for the multiplier, that's what you get. If you want to change that to add a fraction more or less, you need to also mess with BCLK, bump it to 103.7 etc, but that's not advised much for Intel cpu's, BCLK is best left at 100.0 during manual OC.