Chapter 4: AMI BIOS
4-9
QPI L0s and L1
This enables the QPI power state to low power. L0s and L1 are automatically se-
lected by the motherboard. The options are
Enabled
and Disabled.
Memory Frequency
This feature forces a DDR3 memory module to run at a specifi c frequency. The avail-
able options are
Auto
, Force DDR-800, Force DDR-1066, and Force DDR-1333.
Memory Mode
The options are
Independent
, Channel Mirror, Lockstep and Sparing.
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 options 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
, 1.5oC, 3.0
o
C, and 6.0
o
C.
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