Tomcat i7230A S5160 

                                                                  Chapter 3: BIOS Setup 

Thermal Management 2 

Thermal Management throttles the processor back as it reaches its maximum operating 

temperature. Throttling reduces the number of processing cycles, thereby diminishing the heat 

dissipation of the CPU. This cools the unit. Once the CPU has reached a safe operating 

temperature, thermal throttling is automatically disabled, and normal full speed processing 

begins again. 

The BIOS supports two types of thermal management. 

Thermal Monitor 1: Thermal Monitor 1 uses a highly accurate on die 

temperature sensing circuit in the CPU that has the ability to act quickly 

upon any thermal issues (~50ns). This circuitry keeps an eye on the most 

taxed areas of the CPU die at all times and will quickly act upon 

temperatures going over the safety limits. The thermal monitor's control 

circuit, when active, lowers the CPU temperature by throttling the internal 

CPU clock speed. This is done with a 50% duty cycle, which means that a 

2GHz CPU will then effectively run at a 1GHz clock speed. Due to the fast 

response time of the thermal monitor circuit (~50ns) the CPU will only be 

`throttled' for a very brief period. Once the CPU die temperature is within 

safe operating limits again it'll set back to the 2GHz clock speed it 

originally operated at. 

Thermal Monitor 2: Thermal Monitor 2 decreases or increases the CPU 

clock and core voltage according to the CPU load. This information is read 

from the five VID pins of the CPU. Accordingly, the CPU temperature is 

also automatically decreased, when the core voltage is decreased. This 

improves the CPU lifespan. The states switch is so fast that the 

performance decrease is insignificant. 

Disabled / Enabled 

Set Max Ext CPUID=3 

Sets Max CPUID extended function value to 3. 

Disabled / Enabled 

C1 Enhanced Mode 

This feature is used to enable the C1 Enhanced mode. 

Disabled / Enabled 

VT Feature 

This feature is used to enable the VT feature. 

Disabled / Enabled 

No Execute Mode Mem Protection 

This feature is used to enable the function of No Execute Mode Mem Protection. 

Enabled / Disabled 

Frequency Ratio 

This feature is used to set the Frequency Ratio 

X 8 / 19 /14 /15 / 16 / 17 / 18 

Processor Power Management 

This feature is used to set the Processor Power Management. 

GV1/ GV3 Only / Disabled / C States Only / Enabled 

39

http://www.tyan.com