Chapter 7: BIOS
7-9
CPU P State Control
EIST (P-States)
EIST (Enhanced Intel SpeedStep Technology) allows the system to automatically
adjust processor voltage and core frequency to reduce power consumption and
heat dissipation. The options are Disable and Enable.
Turbo Mode (Available when Intel® EIST Technology is enabled)
Select Enable to use the Turbo Mode to boost system performance. The options
are Enable and Disable.
P-State Coordination
This feature determines how an ACPI-aware operating system will coordinate
P-State transitions between logical processors. P-State is also known as
"SpeedStep" for Intel processors. Select HW_ALL to change the P-State coor-
dination type for all hardware components. This option is recommended for the
E5-2600 V3/V4 platform. Select SW_ALL to change the P-State coordination type
for all software installed in the system. Select SW_ANY to change the P-State
coordination type for a particular software program specifi ed by the user. The
options are HW_All, SW_ALL, and SW_ANY.
CPU C State Control
Package C-State limit
Use this item to set the limit on the C-State package register. The options are
C0/C1 State, C2 State, C6 (Non Retention) State, and C6 (Retention) State.
CPU C3 Report
Select Enable to allow the BIOS to report the CPU C3 State (ACPI C2) to the
operating system. During the CPU C3 State, the CPU clock generator is turned
off. The options are Enable and Disable.
CPU C6 Report
Select Enable to allow the BIOS to report the CPU C6 State (ACPI C3) to the
operating system. During the CPU C6 State, the power to all cache is turned
off. The options are Enable and Disable.
Enhanced Halt State (C1E)
Select Enable to use Enhanced Halt-State technology, which will signifi cantly
reduce CPU power consumption by reducing CPU clock cycle and voltage during
a Halt-state. The options are Disable and Enable.
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