Acer Altos R920 Series - Manual (Page 187)

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Memory sparing population
The tables below list the suggested FBDIMM module population for
memory sparing configuration.
Population with two memory boards
* DIMM slot 1 in memory boards A and B is configured to sparing mode.
Population with four memory boards
* DIMM slot 1 in memory boards A, B, C, and D is configured to sparing mode.
DIMM
slot*
Memory board
A
Memory board
B
Memory board
C
Memory board
D
Total memory
Physical
memory
Detected
by OS
1 to 2 2 x 1 GB 2 x 1 GB 4 GB 3 GB
1 to 4 4 x 1 GB 4 x 1 GB 8 GB 7 GB
1 to 6 6 x 1 GB 6 x 1 GB 12 GB 11 GB
1 to 8 8 x 1 GB 8 x 1 GB 16 GB 15 GB
1 to 2 2 x 2 GB 2 x 2 GB 8 GB 6 GB
1 to 4 4 x 2 GB 4 x 2 GB 16 GB 14 GB
1 to 6 6 x 2 GB 6 x 2 GB 24 GB 22 GB
1 to 8 8 x 2 GB 8 x 2 GB 32 GB 30 GB
1 to 2 2 x 4 GB 2 x 4 GB 16 GB 12 GB
1 to 4 4 x 4 GB 4 x 4 GB 32 GB 28 GB
1 to 6 6 x 4 GB 6 x 4 GB 48 GB 44 GB
1 to 8 8 x 4 GB 8 x 4 GB 64 GB 60 GB
DIMM
slot*
Memory board
A
Memory board
B
Memory board
C
Memory board
D
Total memory
Physical
memory
Detected
by OS
1 to 2 2 x 1 GB 2 x 1 GB 2 x 1 GB 2 x 1 GB 8 GB 6 GB
1 to 4 4 x 1 GB 4 x 1 GB 4 x 1 GB 4 x 1 GB 16 GB 14 GB
1 to 6 6 x 1 GB 6 x 1 GB 6 x 1 GB 6 x 1 GB 24 GB 22 GB
1 to 8 8 x 1 GB 8 x 1 GB 8 x 1 GB 8 x 1 GB 32 GB 30 GB
1 to 2 2 x 2 GB 2 x 2 GB 2 x 2 GB 2 x 2 GB 16 GB 12 GB
1 to 4 4 x 2 GB 4 x 2 GB 4 x 2 GB 4 x 2 GB 32 GB 28 GB
1 to 6 6 x 2 GB 6 x 2 GB 6 x 2 GB 6 x 2 GB 48 GB 44 GB
1 to 8 8 x 2 GB 8 x 2 GB 8 x 2 GB 8 x 2 GB 64 GB 60 GB
1 to 2 2 x 4 GB 2 x 4 GB 2 x 4 GB 2 x 4 GB 32 GB 24 GB
1 to 4 4 x 4 GB 4 x 4 GB 4 x 4 GB 4 x 4 GB 64 GB 56 GB
1 to 6 6 x 4 GB 6 x 4 GB 6 x 4 GB 6 x 4 GB 96 GB 88 GB
1 to 8 8 x 4 GB 8 x 4 GB 8 x 4 GB 8 x 4 GB 128 GB 120 GB