Gigabyte GA-7BESH User Manual page 35

Extend RAM Step
Enabled
Disabled
Memory Branch Mode
Sequential
Interleave
Mirror
Single Channel 0
Branch 0 Rank Sparing
Enabled
Disabled
Enable test extended memroy process.
Disable this function. (Default value)
Memory will use sequential mode to save date.
Memory will use Interleave mode for to distribute every one memory
to save date. (Default value)
Mirror will use backup date by image. Only half of the total memory is
report to OS.
Disable Default operate Dual channel Mode. Only Single channel 0
will be detect.
Enable this item, memory will spare two(dual channel) of all slots.
Disable this function. (Default value)
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BIOS Setup