Parameters of Processor Overclocking. Part II

BCLK Frequency (Base Clock)

This parameter is used in motherboards based on the Core i3/5/7 processors and allows changing a base frequency, on which processor operating frequencies, QPI buses, memory and its controller depend. Original value of a base frequency is 133 MHz, and the step and range adjustment depend on the motherboard model. To access this parameter, you might turn on a manual frequency setting with the help of the “Base Clock Control” parameter or similar to it.

QPI Frequency (QPI Link Speed)

This parameter allows setting the frequency of QPI bus which is used for linking the Core i3/5/7 processor with chipset.

Possible values:

  • Auto – the QPI frequency is set automatically according to the processor plate parameters;
  • x3b, x44, x48 – a multiplier which defined the QPI frequency toward the base one (133 MHz);
  • 4800, 5866, 6400 – some motherboards may contain digital value of frequency in megahertz instead of multiplier.

CPU/NB Frequency (Adjust CPU/NB Ratio)

This parameter allows setting the frequency of memory controller integrated into the AMD processor. Depending on the motherboard model, the frequency in megahertz or multiplier toward the base frequency can be used as values.

CPU Voltage Control (CPU VCore Voltage)

You may change the power supply voltage of the central processor with the help of this parameter. Such action is sometimes necessary while overclocking. Possible values:

  • Auto (Normal) – the processor power supply voltage is set automatically according to its plate parameters;
  • digital voltage value from 0,85 to 1,75 W (a range and step adjustment may vary depending on the motherboard model).

For this purpose some motherboards use the “CPU Over Voltage” parameter which allows increasing voltage toward the plate one on a set value.


Too high supply voltage can disable the processor. The permissible voltage increasing for most of modern processors is 0,2-0,3 W.