MSI H55M-E21 manual Chapter

MS-7636

▶C1E Support

To enable this item to read the CPU power consumption while idle. Not all processors support Enhanced Halt state (C1E).

▶OverSpeed Protection

Overspeed Protection function can monitor the current CPU draws as well as its power consumption. If it exceeds a certain level, the processor automatically reduces its clock speed. If you want to overclock your CPU, set it to [Disabled].

▶Hyper-Threading Function

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.

Important

Enabling the functionality of Hyper-Threading Technology for your computer system requires ALL of the following platform Components:

•CPU: An Intel® Processor with HT Technology;

•Chipset: An Intel® Chipset that supports HT Technology;

•BIOS: A BIOS that supports HT Technology and has it enabled;

•OS: An operating system that supports HT Technology.

For more information on Hyper-threading Technology, go to:

http://www.intel.com/products/ht/hyperthreading_more.htm

▶Execute Bit Support

Intel’s Execute Disable Bit functionality can prevent certain classes of malicious “buffer overflow” attacks when combined with a supporting operating system. 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.

▶Set Limit CPUID MaxVal to 3

The Max CPUID Value Limit is designed limit the listed speed of the processor to older operating systems.

▶Intel Virtualization Tech

This item is used to enable/disable the Intel Virtualization technology. For further information please refer to Intel’s official website.

▶Intel VT-d Tech

This item is used to enable/disable the Intel Virtualization Technology for Directed I/O (VT-d). For further information please refer to Intel’s official website.

Chapter 3

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