Acer Altos R910 - Manual (Page 117)

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Configuration
Possible Indicates whether the selected configuration is possible
with the current installed memory.
If No is displayed, you may need to install more memory
to meet the requirements of the selected configuration.
Sparing Indicates whether the selected configuration supports
sparing.
Hot Replace Indicates whether the selected configuration allow
memory to be replaced while the system is running.
Hot Add Indicates whether the selected configuration allow
memory to be added while the system is running.
Board
Interleave Indicates the board interleave for a chosen configuration.
In mixed interleave, BIOS configures the best possible
interleave for each memory range.
Parameter Description