Processor and Cache Memory Settings. Part IV

CPU Cores Enabled

(Active Processor Cores)

This parameter allows selecting the amount of active cores in multi-core processor.

Possible values:

  • ALL – all cores are used (recommended value);
  • 1,2,3 – the amount of active cores will be limited by a set number. This value may be necessary for experiments or installation of outdated operating systems.

In some motherboards you can find such parameters as Core Multi-Processing, CPU Multi-Threading or SW Single Processor Mode, with the help of which you disconnect all cores except the first one.

Enhanced CI Control (Enhance Halt State,

C-State, C1E Function)

This parameter controls the processor operation in low-power mode following the commend “Halt”.

Possible values:

  • Auto (Enabled) – the usage of C1E mode is allowed (recommended value);
  • Disabled – C1E mode is off.

Thermal Management

This parameter sets one or two modes for overheat protection system in the Intel processors.

Possible values:

  • Thermal Monitor 1 (TM1) – in case of overheating a processor might miss several working clock cycles that will lead to its cooling;
  • Thermal Monitor 2 (TM2) – a processor decreases an internal clock frequency for cooling; this reduces pressure more smoothly than in case of missing cycles.

In some versions of BIOS there is a similar parameter – CPU Thermal Monitor 2 (TM2) that controls the TM2 mode. It sometimes has additional parameters, for example TM2 Bus Ratio and TM2 Bus VID which set the multiplying ratio and power supply voltage during overheating.