Modern motherboards support rather wide frequency ranges of FSB (Front Side Bus) – for example, from 100 to 400 MHz. It is unlikely to use the whole frequency range: first of all, a processor will be strongly heated and all positive effects of overclocking will be reversed, and secondly, some failures will occur in the rest equipment, for example, in video system. But it is possible to increase the bus frequency up to 10-20% without any implications.
Open a section “Frequency/Voltage Control” and select a parameter “CPU USB Clock” (CPU Host Clock Select, CPU Bus Frequency, CPU Host Clock). Select one of proposed values for this parameter. These values could be shown as a continuous spectrum, for example from 100 to 220 MHz, or a set of discrete values (in MHz): 66, 75, 83, 100, 103, 112, 124, 133 and other. To increase the frequency, it is recommended to select the value following the current one.
Most setup parameters of bus frequency have the value Auto or Default which is set by default and is the recommended one.
A parameter “CPU Operating Speed” enables either to install the user value of a bus frequency (a value “User Define”) or to select one of fixed ratios of CPU kernel frequency and a bus frequency.