|It can confusing when you start talking frequency vs FSB. I try to stick with frequency to make things easier. The most optimal CPU:RAM frequency ratios are 1:1 & 1:2 for all Intel CPUs prior to the Core-i series. The only exception to that rule is the Pentium 4 series. It was found that due to the inefficiency of the P4 architecture, it would perform better if the RAM frequency was higher than the CPU frequency.|
"when I change the AI Overclocking setting to manual, it doesn't unlocks me the ratio setting, wich is on the CPU Configuration"
I believe the CPU Configuration menu is for information only. If there's no multiplier setting in any of the other menus, all you can do is try raising the CPU frequency a little at a time. The 1st thing I suggest is that you get CPU-Z so that you can monitor your settings from Windows:
Overclocking isn't an exact science. There's a lot of trial & error involved, so don't get frustrated if you encounter problems along the way. All you'll need to do is use the Clear CMOS jumper to reset the BIOS, then start over again. It's almost impossible to damage the hardware unless you increase the voltage too much. Here's a link to your CPU specs so that you can get a look at the safe voltage range:
The only time you would need to increase the voltage would be to stabilize the overclock. Make sure to lock down the PCIe at 100MHz & if there are any Spread Spectrum settings, disable them. Then try increasing the CPU frequency from 200MHz to 210MHz. Save the settings & reboot. Your CPU should then run at 2.625GHz. Use CPU-Z to check the CPU speed. Also have a look at the RAM speed, it may increase along with the CPU.
Here's where the voltage increase comes into play. Let's say you tried the CPU frequency at 210MHz, then 215, then 220, & all is well. Then you try 225MHz & the system becomes unstable or unbootable. You would then have the choice of either backing off to 220MHz & calling it quits, or increasing the CPU voltage slightly & trying for 225MHz again. Always increase voltages in small increments & it's generally best to stay within the voltage range supplied by the manufacturer. Also, voltage increases usually raise the CPU temp so keep watch on your temp readings.