In the setting, “CPU Level Up,” I only have two choices, “Auto” and “Crazy.” The Extreme will likely have different choices, and apparently what appears as choices under this menu is dependent on what CPU is installed. On my Formula MB, “Crazy” takes it to 3.8. Or I can leave it set to “Auto, ” set Ai Overclock Tuner to “Manual, ” and then set any individual parameter below the dashed line that I wish. I’m able to set only FSB Frequency and leave all others set on “Auto” to achieve 4.0. Having zero experience OCing other boards, I don’t know if they have similar menus, but the ability to set single parameters and then let the board make appropriate choices by choosing “Auto” for other settings makes it very easy to OC. For example with I set FSB Frequency up I notice that the MB cranks up the NB voltage and configures DRAM frequency and voltages automatically.
Something else to consider is the fact that this board seems to run hot. NB and SB at idle were about 55C. I added an 80mm fan to blow across the heatsinks and a top fan in addition to the existing rear and front fans to move more air through the case. My 4870 GPU also adds to the problem as it produces a lot of heat, but with the fan additions I’ve got the bridges down to about 44 idle and 48 loaded.
Watercooling is out of my league for now, and I only OC to run tests anyway, not for day to day use.