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Chapter 7: BIOS
DIMM Information
The status of a memory module is displayed as detected by the BIOS.
Memory Mode
When Independent is selected, all DIMMs are available to the operating system.
When Mirroring is selected, the motherboard maintains two identical copies of all
data in memory for data backup. When Lockstep is selected, the motherboard
uses two areas of memory to run the same set of operations in parallel. The
options are Independent, Mirroring, and Lockstep.
DRAM RAPL Mode
RAPL (Running Average Power Limit) is used to set the power consumption
limit for a processor4. The options are DRAM RAPL MODE0, DRAM RAPL
MODE1, and Disabled.
DDR Speed
Use this feature to force a DDR3 memory module to run at a frequency other
than what is specifi ed by the manufacturer. The options are Auto, Force DDR3
800, Force DDR3 1066, Force DDR3 1333, Force DDR3 1600 and Force SPD.
Channel Interleaving
Use this feature to select channel-interleaving mode for system memory mod-
ules. The options are Auto, 1 Way, 2 Way, 3, Way, and 4 Way.
Rank Interleaving
Use this feature to select rank-interleaving mode for system memory modules.
The options are Auto, 1 Way, 2 Way, 4, Way, and 8 Way.
Patrol Scrub
Patrol Scrubbing is a process that allows the CPU to correct correctable memory
errors detected on a memory module and send the correction to the requestor
(the original source). When this item is set to Enabled, read-and-write will be
performed every 16K cycles per cache line if there is no delay caused by internal
processing. The options are Enabled and Disabled.
Demand Scrub
Demand Scrubbing is a process that allows the CPU to correct correctable
memory errors found on a memory module. When the CPU or I/O issues a
demand-read command, and the read data from memory turns out to be a
correctable error, the error is corrected and sent to the requestor (the original
source). Memory is updated as well. Select Enabled to use Demand Scrubbing
for ECC memory correction. The options are Enabled and Disabled.
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