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2 memory configurations, Memory configurations -12 – Asus P5QL User Manual

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1-12

Chapter 1: Product introduction

1.7.2

Memory configurations

You may install 512MB, 1GB, 2GB, and 4GB unbuffered non-ECC DDR2 DIMMs into the

DIMM sockets.

• 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 the 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.

• Due to the memory address limitation on 32-bit Windows

®

OS, when you install 4GB or

more memory on the motherboard, the actual usable memory for the OS can be about

3GB or less. For effective use of memory, we recommend that you do either of the

following:

-

Install a maximum of 3GB system memory if you are using a 32-bit Windows

®

OS.

-

Use a 64-bit Windows

®

OS if you want to install 4GB or more memory on

the motherboard.

• This motherboard does not support DIMMs made up of 256 megabits (Mb) chips or less.

This motherboard supports up to 16GB on Windows

®

XP Professional x64 and Windows

®

Vista x64 editions. You may install a maximum of 4GB DIMM on each slot.

This manual is related to the following products: