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Chapter 7: BIOS
DDR Speed
Use this feature to force a DDR3 memory module to run at a frequency other
than what is specified in the specification. The options are Auto, Force DDR3
800, Force DDR3 1066, Force DDR3 1333, Force DDR3 1600, Force DDR3
1866, 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
source). Memory is updated as well. Select Enabled to use Demand Scrubbing
for ECC memory correction. The options are Enabled and Disabled.
Data Scrambling
Select Enabled to enable data scrubbing to ensure data security and integrity.
The options are Disabled and Enabled.
Device Tagging
Select Enabled to support device tagging. The options are Disabled and En-
abled.
A7 Address Mode
Select Enabled to support A7 (Addressing) Mode to improve memory perfor-
mance. The options are Auto, Enable, and Disable.
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