OK here we go. first you will want to navigate to the screen in the picture.
The AI Tuning Is what you want to read as Manual.
Then you can change the CPU Frequency (FSB) from stock (200Mhz). You want to do this in 10Mhz increments to start out. After you change it, each time boot to windows and see if it crashes. If it doesn't then reboot and go back into the BIOS and up it again another 10Mhz.
This whole process is a lot of trial and error and can be very time consuming so stick with it.
When you do crash, and you still want to go further, you need to raise your vcore one, maybe two notches. Also, make sure in Advanced Voltage Control, you have the vcore offset set to 200mV. It's the first option there.
Then you can repeat this as needed. You will get to a point where you just can't go any higher however no matter what. Well you do not want to typically raise your vcore over 1.6v. And remember, the vcore offset adds extra voltage to what you have it set at in your BIOS.
What you should do when your FSB gets to about 250Mhz is go lower your HTT multi from 5x down to 4x. That's on the CPU configuration screen BTW.
You want to make sure also, at idle that your temps don't go to high. Because you want your rig to be under 55C at load. What cooling do you have now again?