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Overclock type The relationship between CPU clock and bus clock is woven by a multiplier.
In simple, CPU clock = bus clock x multiplier. For example, AMD Athlon XP 2000 + with a clock speed default is 1666 MHz the resultss of 133 MHz bus clock with multiplier 12.5 (twelve half).

Pentium 4 2.4 GHz is the results of 200 MHz bus with the multiplier 12.
Could also 266 bus clock multiplication with multiplier 9. Why, it becomes 2.394 GHz?
deed, there is rounding to be a whole number. Thus, for to overclock, which can enhanced is the bus clock, multiplier, or both. If the multiplier raised, then the CPU clock will go up, but the bus clock fixed.

Overclock requirements example :
For the example above, the AMD Athlon XP 2 GHz + (1666 Mhz real), if multiplier raised became 20, then the CPU clock rises 2660 MHz to be real. But if bus clock is raised, automatically CPU clock will also rise.

For example, Pentium 4 2.4 GHz with 200 MHz bus clock and multiplier 12 will be Pentium 4 3 GHz if the bus clock was encouraged to 266 MHz. It would be better if the is raised clocknya bus.

try this for step to overclock.
But The second alternative is more difficult considering peripheral capabilities connected to the bus may not be able to work above the standard clock. If CPU
clock is fixed, while the bus was still strong, down just multiplier and increase bus clock ..
This is still better than the alternative first.