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2 memory configurations – Asus P5QPL-VM User Manual

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1-16

Chapter 1: Product introduction

1.7.2

Memory configurations

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

DIMMs into the DIMM sockets.

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

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

of 1 GB DIMMs on each slot, but only DDR2-800 and DDR2-667 1 GB

density modules are available for this configuration.

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

®

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

to run at DDR-667. If this heppens, contact your memory vendor to check

to ODT value.

32-bit

64-bit

Windows

®

XP

Windows

®

XP x64 Edition

Windows

®

Vista

Windows

®

Vista x64 Edition

• 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

configuration. 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.

• For single-channel configuration, you may:

- install one double-sided DIMM in any of the four sockets OR

- install two single-sided DIMMs in DIMM_A1 and DIMM_A2, or in

DIMM_B1 and DIMM_B2.

• For dual-channel configuration, you may:

- install two double-sided DIMMs OR

- install four single-sided DIMMs.

• Only DIMM_A1 and DIMM_B1 support 1066 memory modules.
• When installing total memory of 4GB capacity or more, Windows

®

32-bit

operation system may only recognize less than 3GB. Hence, a total

installed memory of less than 3GB is recommended.

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

256 chips.