User`s manual

Max CPUID Value Limit

The Max CPUID Value Limit BIOS feature allows you to circumvent problems

with older operating systems that do not support Hyper-Threading Technology.

When enabled, the processor will limit the maximum CPUID input value to 03h

when queried, even if the processor supports a higher CPUID input value. When

disabled, the processor will return the actual maximum CPUID input value of the

processor when queried.

Execute Disable Bit Capability

Intel's Execute Disable Bit functionality, when combined with a supporting

operating system, can prevent certain classes of malicious "buffer overflow"

attacks. This functionality allows the processor to classify areas in memory by

where application code can execute and where it cannot. When a malicious

worm attempts to insert code in the buffer, the processor disables code execution,

preventing damage or worm propagation.

Hyper Threading Technology

The processor uses Hyper Threading technology to increase transaction rates

and reduces end-user response times. The technology treats the two cores

inside the processor as two logical processors that can execute instructions

simultaneously. In this way, the system performance is highly improved. If you

disable the function, the processor will use only one core to execute the

instructions. Please disable this item if your operating system doesn’t

support HT Function, or unreliability and instability may occur.

Intel(R) SpeedStep(tm) Tech

EIST (Enhanced Intel

SpeedStep Technology) allows the system to dynamically

adjust processor voltage and core frequency, which can result in decreased

average power consumption and decreased average heat production.