Parameters of Processor Overclocking. Part III

Additional Processor Voltages

Modern processors, except computational cores, may contain cash memory, memory controller and other components. Some motherboards have a possibility to configure the voltage supply and tone levels, but their influence on stability of overclocked system is usually small. Here are some parameters:

  • CPU VTT Voltage – the voltage supply of a controller of QPI bus and cash memory L3 (Intel Core i3/5/7);
  • CPU PLL Voltage – the voltage supply of a circuit of phase frequency autotuning and cash memory L3 in AMD processors;
  • CPU Differential Amplitude (CPU Amplitude Control, CPU Clock Drive) – amplitude adjustment of processor tones;
  • Load-Line Calibration – this parameter allows increasing stability of voltage supply during the high workload on processor.

Advanced Clock Calibration (NVidia Core Calibration)

This parameter is used for improving overclocking of Phenom and Athlon processors. The technology “Advanced Clock Calibration (ACC)” can be found in new chipsets for AMD processors and allows performing adjustment of working frequency and processor voltage supply.

Possible values:

  • Disable – the ACC technology is off, this value is recommended for normal (unoverclocked) mode;
  • Auto – the ACC technology operates automatically, this value is recommended with overclocking;
  • All Cores – you can set the ACC level in per cents for all cores simultaneously with the help of the Value parameter;
  • Per Core – unlike the previous variant, you can set ACC for each core separately. Manual ACC setting can be used in case of unstable system with the Auto value.