Shall we increase the CPU core voltage? Sometimes it might help, but not always. The CPU heats up more during overclocking anyway, and by raising the core voltage you increase the heat dissipation even more. Therefore, I wouldn’t recommend to start playing with unreasonable Vcore settings. Although, this is your system, so you are surely free to do whatever you want. Please, don’t e-mail your complaints to me then: I have just warned you. :)
Clock Frequency Multiplier
As for the CPU clock frequency multiplier, there are a few CPUs that boast an unlocked one, i.e. this multiplier can be changed. Among these CPUs are: AMD Socket A (462) processors manufactured before week 40, 2003; AMD Athlon FX: AMD Socket 754/939 (except the youngest Sempron models). By changing the CPU clock frequency multiplier your acquire more flexibility during CPU overclocking. For example, if you have an old mainboard that doesn’t allow locking the AGP and PCI bus frequencies, you can overclock your CPU by simply increasing the clock frequency multiplier. Since you do not touch the bus frequency at all, the PCI and AGP bus frequencies will stay at their nominal values.
Another situation is also possible: if your CPU has a pretty high nominal clock frequency multiplier already, you can set it to a lower value and thus offer yourself more room for bus overclocking. This way it will certainly contribute to the overall system performance improvement. Some AMD Socket A processors have a locked clock frequency multiplier, however, there are ways to unlock it or “turn” these CPUs into mobile processors, which will also allow adjusting the multiplier. I will not go into all these details this time, but we had a few articles about it in the past, so you may find them in the CPU section on our site.
Emergency Break: Clear CMOS
And what shall we do if the system is over-overclocked, if the parameters have been set incorrectly, and the mainboard doesn’t even boot-up, or system hangs shortly after booting? Some contemporary mainboards monitor the boot-up process and if something interrupts it, the mainboard restarts with the default settings for the processor and system memory. In this case, all you need to do is access the BIOS Setup and set the correct values.
Sometimes, you can cure the system by rebooting it while pressing and holding the <Ins> key. In this case the mainboard also resets all the values to the nominal that allows to boot the system successfully. If nothing helps, you have to find the Clear CMOS jumper, shut the system down, switch it to two next contacts for about three seconds and then return back to the initial position.
Now absolutely all parameters will be reset back to their nominal values. So, next time, don’t go that far.