Acer Altos R920 Series - Manual (Page 184)

Appendix B: Memory configuration 166
The memory boards connect to the mainboard through the memory
board slots A, B, C, and D (Each slot support the x16 PCI Express
mechanical slot, refer to “Mainboard” on page 12 for the location of
the memory board slots.). Each memory board is equipped with eight
DIMM slots that supports 1 GB, 2 GB, or 4 GB DDR2-667 MHz (PC-5300)
FBDIMM modules. The memory board includes a DIMM fault LED that
is used to report DIMM failures and error conditions.
Refer to “Memory configuration” on page 171 for details on the
available system memory configuration.
Memory board installation order
The table below lists the suggested memory board installation order.
Memory
board
slot Installation order
Normal
configuration Memory sparing
configuration Memory mirroring
configuration
A 1 Set 1 Note: Requires
installation of four
memory boards with
equal memory capacity.
B 2
C 3 Set 2
Note: Requires
installation of two or four
sets of memory boards,
paired as sets of two. Each
memory board in a set
must have same amount
of memory board
installed. D 4