As you may already know :
CPUclock = FSB * CPUmultiplier
The FSB is the Front Side Bus clock provided by the motherboard . If the CPU multiplier is set below a certain value , then in order to boost the CPU clock we have to raise the FSB , that will have many effects on the motherboard or memory settings that we'll have to adjust .
Before you begin to change your BIOS configurations , you need to make sure you can "reset you BIOS" to the default settings . This is important simply because your system might be unstable or the operating system might refuse to start . In such case you'll need to reset the BIOS so your system is stable again .
Set your memory timings in your BIOS . The lower the memory timings the faster they are . Refer to the manufacture's specs for getting the best values . Don't worry if you're not sure if they're good as you'll get a chance to modify them later .
Increase your FSB clock speed a little bit . Leave the Vcore and other voltage settings at their default - these are the voltages that operate the system and we want them minimized . The "default" settings are generally an over-estimate but we'll take care of them later .
Test the system with an application that uses memory extensively . If your system runs stable for sufficient time you can go to your BIOS and increase the FSB a bit more and retest . If you're satisfied with the results then go to step 5 .
If the system becomes unstable when testing , try increasing Vcore and Vdimm by one level ( maybe 0 .05v ) and retest . You can continue increasing the voltages or lowering the FSB until you get satisfying results . Be careful though that increasing Vcore higher that 15% than the rated value may damage your chip .
You can now re-adjust the memory timings to get better memory performance .
You might want to adjust your memory divider . When choosing a memory divider value , the memory will be operating in "asynchronous mode" . Running asynchronously may require adjusting the memory voltages manually to make it stable .
When you are satisfied with what you reached so far , try now to lower the voltages' values . We want to minimize voltages to minimize temperature .
that there is a limit for overclocking the memory . You must have a memory that can work with the high FSB speeds you choose . Sometimes you might have to buy another memory . In such case , it's up to you to decide if the performance gain is worth the additional costs of a new memory .
You can follow other mechanisms , as long as you keep your system stable and always observe the temperature . The temperature increases linearly with the FSB and exponentially with the voltage . That's why we don't just set all voltages to their maximum to support max clock speeds . If you have to increase your voltages and you noticed a massive increase in the system temperature , you can purchase additional cooling devices . You can test your system performance and temperature in detail using some software tools like SiSoft Sandra , Memtest86+ and Prime95 . Give a lot of time to testing for long times to make sure your system is stable with your new settings and is working at the speed you were wishing for.