User`s manual

Chapter 7: BIOS
7-9
Memory Frequency
This feature forces a DDR3 frequency slower than what the system has detected
to run at the frequency as specifi ed. The available options are Auto, Force DDR-
800, Force DDR-1066, Force DDR-1333 and Force SPD.
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 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 predefi ned 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.
Guardband Temperature (Closed Loop only)
This is the temperature applied to the DIMM temperature threshold. Each
step is in 0.5
o
C increments. The default is [006]. Press <+> or <-> on your
keyboard to change this value.