Chapter 6: BIOS
CPU & Clock Configuration
The menu options in the CPU CONFIGURATION submenu and their descriptions are shown in Table
| Table | |
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Menu Option | Description | |
| This menu displays static information for Module Version, Manufacturer, | |
CPU Settings (Static) | Frequency, BCLK Speed, Cache L1, Cache L2, Cache L3, Ratio Status and | |
| Ratio Actual Value. | |
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Ratio CMOS Setting | This setting sets the ratio between CPU Core Clock and the FSB Frequency. The | |
default is 20. | ||
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| For UP platorms leave this setting enabled. For DP/MP servers, you can use this | |
Hardware Prefetcher | setting to tune performance to the specific application.Settings are Enabled and | |
| Disabled. | |
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Adjacent Cache Line | For UP platorms leave this setting enabled. For DP/MP servers, you can use this | |
setting to tune performance to the specific application.Settings are Enabled and | ||
Prefetch | ||
Disabled. | ||
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MPS and ACPI | This setting specifies either MODERN ORDERING for Windows XP or later OS’s or | |
MADT Ordering | Legacy Ordering for Windows 2000 or earlier OS’s. | |
Max CPUID Value | This setting is disabled for WindowsXP. Settings are Enabled and Disabled. | |
Limit | ||
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Intel (R) Virtualization | When enabled, a VMM can utilize the additional HW Caps that are provided by | |
Intel Virtualization Technology. Settings are Enabled and Disabled. | ||
Tech | NOTE: A full reset is required to change this setting. | |
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When disabled, this setting forces the XD feature flag to always return to 0. | ||
Capability | Settings are Enabled and Disabled. | |
Intel (R) HT | When Disabled, only one thread per enabled core is enabled. Settings are | |
Technology | Enabled and Disabled. | |
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Active Processor | This setting specifies the number of cores in each processor package to activate. | |
Cores | Settings are All, 1 or 2. | |
A20M | Legacy OSes and APs may need A20M enabled. Settings are Enabled and | |
Disabled. | ||
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Intel SpeedStep(tm) | Use this setting to enable or disable GV3. Settings are Enabled and Disabled. | |
tech | ||
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Intel (R) TurboMode | Turbo mode allows the processor cores to run faster than their marked frequency | |
Tech | in specific conditions. Settings are Enabled and Disabled. | |
Intel (R) | When enabled, the CPU idle is set to C2/C3/C4. Settings are Enabled and | |
| Disabled. | |
C3 State | Use this setting to select the Nehalem | |
ACPI C2 and ACPI C3. | ||
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C6 State | Use this setting to enable or disable the Nehalem C6 state action. Settings are | |
Enabled and Disabled. | ||
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C State Package | Use this setting to select the option that will program into C State the package | |
Limit Setting | limit register. Settings include Auto, C1, C3, C6 and C7. |