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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 conguration, 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 Qualied 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 SE

240-pin DDR2 DIMM Sockets

DIMM_B2

DIMM_A1

DIMM_A2

DIMM_B1

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