17 SIMB-M21 User Manual
Chapter 2 Product Introduction
2.5.2 Memory Configurations
You may install 1 GB, 2 GB, and 4 GB unbuffered ECC or non-ECC DDR3 SO-
DIMMs into the SO-DIMM sockets using the memory configurations in this section.
2.5.3 Installing a SO-DIMM
1. Unlock a DIMM socket by pressing the retaining clips outward.
Table 2.5: 204-pin DDR3 DIMM sockets
Channel Socket
Channel A DIMMA1
Channel B DIMMB1
Important!
If you installed four 1GB memory modules, the system may detect
less than 3GB of total memory because of address space alloca-
tion for other critical functions. This limitation applies to Windows
XP 32-bit version operating system since it does not support PAE
(Physical Address Extension) mode.
If you install Windows XP 32-bit version operating system, we rec-
ommend that you install less than 3GB of total memory.
For dual-channel configuration, the total size of memory module(s)
installed per channel must be the same for better performance
(DIMMA1=DIMMB1).
Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules
from the same vendor. Refer to the memory Qualified Vendors List
on the next page for details.
Due to CPU limitation, DIMM modules with 128 Mb memory chips
or double-sided x16 memory chips are not supported in this moth-
erboard.
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