Acer Altos R920 Series - Manual (Page 95)

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Installing and removing DIMM modules
The server’s memory board supports eight DIMM slots. Each slot
supports 1 GB, 2 GB, and 4 GB DDR2-667 (PC2-5300) FBDIMM modules.
The server’s maximum memory capacity is 128 GB.
DIMM module configuration guidelines
Observe the following guidelines when replacing or installing DIMM
modules to the memory boards.
• The system supports up to four memory boards. At least one
memory board and two DIMMs must be installed for the server to
function. Each memory board must have a minimum of two
DIMMs installed.
• DIMMs must be installed in pairs. For example, DIMM slots 1 and 2,
DIMM slots 3 and 4, DIMM slots 5 and 6, DIMM slots 7 and 8
• DIMMs in the same memory board must be identical in size, speed,
and vendor.
• The system does not support mixed-sized DIMMs or DIMMs from
different vendors within the same memory board.
Warning! Functionality issues may be encountered if mixed
memory types are installed on the memory board.
• The system does not support combination of single-rank with dual-
rank memory.
• Use only DDR2 FBDIMMs. Other type of DIMMs will not fit into the
socket. Attempts to force a non-DDR2 FBDIMM into a socket will
damage and/or the socket or the DIMM.
• Hold DIMMs only by the edges. Do not touch the components or
gold edge connectors.
• Install DIMMs with gold-plated edge connectors only.
Important: Follow the DIMM module “FBDIMM module
population order” section on page 167 when installing and
removing DIMMs.