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Chapter 7: BIOS
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) provides mechanisms to enforce power
consumption limits on supported processors 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
This feature selects from the different channel interleaving methods. The
options are Auto, 1 Way, 2 Way, 3, Way, and 4 Way.
Rank Interleaving
This feature allows the user to select a rank memory interleaving method.
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, the IO
hub will read and write back one cache line every 16K cycles, if there is no
delay caused by internal processing. By using this method, roughly 64 GB
of memory behind the IO hub will be scrubbed every day. 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
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