Upgrading The System Memory; Memory Module Population Guidelines - Acer Altos R5250 Series User Manual

Upgrading the system memory

Acer Altos R5250 server supports sixteen DDR2 DIMM slots. The DIMM
slots support dual channel DDR2-667 registered ECC memory modules.
Important:
When you are using a single-processor server, you should install a
pair of identical modules into the DIMM A1 and B1, DIMM A2 and
B2, DIMM A3 and B3, or DIMM A4 and B4 slots.
The DIMM C1 to DIMM D4 slots are enabled when a second
processor is installed on the mainboard. For instructions on how to
install a second processor, see "To install a second processor"
section on page 46.
When you are using a dual-processor server, you should employ a
paired DIMM configuration by installing modules in the DIMM A,
B and DIMM C, D slots.

Memory module population guidelines

• Memory modules must be installed or removed in matched pairs,
following the slot sequence listed below.
• CPU 1 — Populate DIMM slots A1 and B1 first, followed by
slots A2 and B2, A3 and B3, and A4 and B4
• CPU 2 — Populate DIMM slots C1 and D1 first, followed by
slots C2 and D2, C3 and D3, and C4 and D4
DIMMC4
DIMMD4
DIMMC3
DIMMD3
DIMMC2
DIMMD2
DIMMC1
DIMMD1
Note: Refer to "Mainboard layout" on page 11 for the location of
the DIMM slots for each processor.
CPU2
CPU1
47
3
3
4
4