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1-16 Chapter 1: Product introduction
1.7 System memory
1.7.1 Overview
The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline
Memory Modules (DIMM) sockets.
A DDR2 module has the same physical dimensions as a DDR DIMM but has
a 240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are
notched differently to prevent installation on a DDR DIMM socket.
The gure illustrates the location of the DDR2 DIMM sockets:
Channel Sockets
Channel A DIMM_A1 and DIMM_A2
Channel B DIMM_B1 and DIMM_B2
1.7.2 Memory configurations
You may install 256 MB, 512 MB, 1 GB, 2 GB and 4 GB unbuffered non-ECC
DDR2 DIMMs into the DIMM sockets.
• For dual-channel conguration, the total size of memory module(s)
installed per channel must be the same
(DIMM_A1 + DIMM_A2 = DIMM_B1 + DIMM_B2).
• 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 DDR2 Qualied Vendors List on the next
page for details.
• If you install four 1GB memory modules, the system may only recognize
less than 3 GB because the address space is reserved for other critical
functions. This limitation appears on Windows
®
XP 32-bit operation
system which does not support Physical Address Extension (PAE).
• If you install Windows
®
XP 32-bit operation system, a total memory of
less than 3GB is recommended.
P5ND2
R
P5ND2
240-pin DDR2 DIMM Sockets
DIMM_B2
DIMM_A1
DIMM_A2
DIMM_B1
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