Chapter 4: AMI BIOS
4-9
QPI L0s and L1
This enables the QPI power state to low power. L0s and L1 are automatically
selected by the motherboard. The options are Disabled and Enabled.
Memory Frequency
This feature forces a DDR3 frequency slower than what the system has detected.
The available options are Auto, Force DDR-800, Force DDR-1066, and Force
DDR-1333.
Memory Mode
The options are Independent, Channel Mirror, and Lockstep.
Independent - All DIMMs are available to the operating system.
Channel Mirror - The motherboard maintains two identical copies of all data in
memory for redundancy.
Lockstep - The motherboard uses two areas of memory to run the same set of
operations in parallel.
Sparing - A preset threshold of correctable errors is used to trigger fail-over.
The spare memory is put online and used as active memory in place of the
failed memory.
Demand Scrubbing
A memory error-correction scheme where the Processor writes corrected data
back into the memory block from where it was read by the Processor. The op-
tions are Enabled and Disabled.
Patrol Scrubbing
A memory error-correction scheme that works in the background looking for and
correcting resident errors. The options are Enabled and Disabled.
Throttling - Closed Loop / Throttling - Open Loop
Throttling improves reliability and reduces power in the processor by automatic
voltage control during processor idle states. Available options are Disabled and
Enabled. If Enabled, the following items will appear:
Hysteresis Temperature (Closed Loop only)
Temperature Hysteresis is the temperature lag (in degrees Celsius) after the
set DIMM temperature threshold is reached before Closed Loop Throttling
begins. The options are Disabled, 1.5
o
C, 3.0
o
C, and 6.0
o
C.
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