Asus P5E-VM DO User Manual download pdf (Page 32)

1-20 Chapter 1: Product introduction

• You may install varying memory sizes in Channel A and Channel B. The

system maps the total size of the lower-sized channel for the dual-channel

conguration. Any excess memory from the higher-sized channel is then

mapped for single-channel operation.

• 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 four 1 GB memory modules, the system may detect less than

3GB because the address allocation for other critical functions. This limitation

applies to Windows

Vista 32-bit/ Windows

XP 32-bit version operation

system since it does not support Physical Address Extension (PAE) mode.

• This motherboard does not support memory modules made up of 128 Mb

chips or double sided x16 memory modules.

Notes on memory limitations

• Due to chipset limitation, this motherboard can only support up to

8 GB on the operating systems listed below. You may install a maximum of

2 GB DIMMs on each slot, but only DDR2-533 and DDR2-667 2 GB density

modules are available for this conguration.

• Some old-version DDR2-800 DIMMs may not match Intel

On-Die-Termination (ODT) requirement and will automatically downgrade

to run at DDR2-667. If this happens, contact your memory vendor to check

the ODT value.

• Due to chipset limitation, DDR2-800 with CL=4 will be downgraded to run

at DDR2-667 by default setting. If you want to operate with lower latency,

adjust the memory timing manually.

• The total memory may has 8MB reduction under Single Channel mode, and

16MB reduction under Dual Channel mode because the address space

is reserved for the Intel

vPro

™

Technology and the Intel

Quiet System

Technology.

64-bit

Windows XP Professional x64 Edition

Windows Vista Professional x64 Edition

1.7.2 Memory congurations

You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered non-ECC DDR2

DIMMs into the DIMM sockets.

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Asus P5E-VM DO User Manual Page 32