Supermicro A1SRM-2758F User Manual download pdf (Page 69)

Chapter 4: AMI BIOS

4-9

Package C State limit

Select Auto for the AMI BIOS to automatically set the limit on the C-State packag-

ing register. The options are No Limit, C1 state, C2 state, C3 state, C4 state, and

C6 (non Retention) state.

Enhanced Halt State (C1E)

Select Enabled for "Enhanced Halt State" (C1E) support, which will signicantly

reduce the CPU's power consumption by reducing the CPU's clock cycle and volt-

age during a Halt State. The options are Disabled and Enabled.

Monitor/Mwait

If this feature is set to Enabled, the processor will carry out the "Monitor/Mwait"

instruction by specifying an address on which to wait (Monitor) and giving an instruc-

tion to start the "wait operation" (Mwait). The options are Disabled and Enabled.

L1 Prefetcher (Available when supported by the CPU)

If set to Enabled, the L1 cache prefetcher will prefetch streams of data and instruc-

tions from the main memory to the L1 cache to improve CPU performance. The

options are Disabled and Enabled.

L2 Prefetcher (Available when supported by the CPU)

If set to Enabled, the L2 cache prefetcher will prefetch streams of data and instruc-

tions from the L1 cache to the L2 cache to improve CPU performance. The options

are Disabled and Enabled.

ACPI 3.0 T-States (Available when supported by the CPU)

Select Enabled to support Advanced Conguration and Power Interface (ACPI)

3.0 T-States, which will allow the CPU driver to receive _TPC change notications

for CPU speed control to improve system cooling. The options are Enabled and

Disabled.

Max CPUID Limit

Select Enabled to set the maximum CPU ID value and to boot the legacy operat-

ing systems that cannot support processors with extended CPUID functions. The

options are Enabled and Disabled (for the Windows OS).

Execute-Disable Bit (Available if supported by the OS & the CPU)

Set to Enabled to provide Execute Disable Bit support which will allow the processor

to designate areas in the system memory where an application code can execute

and where it cannot, thus preventing a worm or a virus from ooding illegal codes

to overwhelm the processor or damage the system during an attack. The default is

Enabled. (Refer to Intel and Microsoft Web Sites for more information.)

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Supermicro A1SRM-2758F User Manual Page 69