1.7System memory

1.7.1Overview

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 figure illustrates the location of the DDR2 DIMM sockets:

DIMM1

DIMM2

P5SD2-VM

112 Pins 128 Pins

P5SD2-VM 240-pin DDR2 DIMM Sockets

1.7.2Memory configurations

You may install 512 MB, 1 GB and 2 GB unbuffered non‑ECC DDR2 DIMMs into the DIMM sockets.

•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.

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Chapter 1: Product introduction