Acer R910 Series manual Dimm population with mirroring

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Population with four memory boards

Memory board A		Memory board B		Memory board C		Memory board D		Total Memory
1A/1B	2A/2B	1A/1B	2A/2B	1A/1B	2A/2B	1A/1B	2A/2B	Physical	Detected
								memory by OS
2 x	2 x	2 x	2 x	2 x	2 x	2 x	2 x
512 MB	512 MB	512 MB	512 MB	512 MB	512 MB	512 MB	512 MB	8 GB	4 GB
(Sparing)		(Sparing)		(Sparing)		(Sparing)
2 x 1 GB	2 x 1 GB	2 x 1 GB	2 x 1 GB	2 x 1 GB	2 x 1 GB	2 x 1 GB	2 x 1 GB	16 GB	8 GB
(Sparing)		(Sparing)		(Sparing)		(Sparing)
2 x 2 GB	2 x 2GB	2 x 2 GB	2 x 2GB	2 x 2 GB	2 x 2 GB	2 x 2 GB	2 x 2 GB	32 GB	16 GB
(Sparing)		(Sparing)		(Sparing)		(Sparing)
2 x 4 GB		2 x 4 GB		2 x 4 GB		2 x 4 GB		32 GB	16 GB
(Sparing)*		(Sparing)*		(Sparing)*		(Sparing)*
2 x 4 GB	2 x 4 GB	2 x 4 GB	2 x 4 GB	2 x 4 GB	2 x 4 GB	2 x 4 GB	2 x 4 GB	64 GB	32 GB
(Sparing)*		(Sparing)*		(Sparing)*		(Sparing)*

*Only 4GB of memory installed in DIMM 1A/1B slots will be reserved as spare DIMMs, one rank from each dual-rank DIMM.

DIMM population with mirroring

The tables below list the suggested DDR2 DIMM module population for memory mirroring configuration.

Population with two memory boards

Memory board A		Memory board B		Memory board C		Memory board D	Total Memory
1A/1B	2A/2B	1A/1B	2A/2B	1A/1B	2A/2B	1A/1B 2A/2B	Physical	Detected
							memory	by OS
2 x		2 x
512 MB		512 MB					2 GB	1 GB
		(Mirror)
2 x	2 x	2 x	2 x
512 MB	512 MB	512 MB	512 MB				4 GB	2 GB
		(Mirror)	(Mirror)
2 x 1 GB		2 x 1 GB					4 GB	2 GB
		(Mirror)
2 x 1 GB	2 x 1 GB	2 x 1 GB	2 x 1 GB				8 GB	4 GB
		(Mirror)	(Mirror)
2 x 2 GB		2 x 2 GB					8 GB	4 GB
		(Mirror)
2 x 2 GB	2 x 2 GB	2 x 2 GB	2 x 2 GB				16 GB	8 GB
		(Mirror)	(Mirror)
2 x 4 GB		2 x 4 GB					16 GB	8 GB
		(Mirror)
2 x 4 GB	2 x 4 GB	2 x 4 GB	2 x 4 GB				32 GB	16 GB
		(Mirror)	(Mirror)