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1-16 Chapter 1: Product introduction
1.7 System memory
1.7.1 Overview
The motherboard comes with two 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:
1.7.2 Memory congurations
You may install 512 MB, 1 GB and 2 GB unbuffered non-ECC DDR2 DIMMs into
the DIMM sockets.
P5SD2-VM
240-pin DDR2 DIMM Sockets
P5SD2-VM
128 Pins
112 Pins
DIMM2
DIMM1
• Always install DIMMs with the same CAS latency. For optimum compatibility,
it is recommended that you obtain memory modules from the same vendor.
• If you install two 2GB memory modules, the system may only
recognize less than 3GB 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.