Asus A78M-A User Manual download pdf (Page 16)

1-8

Chapter 1: Product introduction

1.4.2 Memory congurations

You may install 1GB, 2GB, 4GB, and 8GB unbuffered non-ECC DDR3 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 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 optimal compatibility, we

recommend that you install memory modules of the same version or date code (D/C)

from the same vendor. Check with the retailer to get the correct memory modules.

• 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 any of the

following:

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

OS.

- Install a 64-bit Windows

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

motherboard.

• This motherboard does not support DIMMs made up of 512Mb (64MB) chips or less.

1.4 System memory

1.4.1 Overview

This motherboard comes with four Double Data Rate 3 (DDR3) Dual Inline Memory Modules

(DIMM) sockets.

A DDR3 module has the same physical dimensions as a DDR2 DIMM but is notched

differently to prevent installation on a DDR2 DIMM socket. DDR3 modules are developed for

better performance with less power consumption.

The gure illustrates the location of the DDR3 DIMM sockets:

A78M-A

A78M-A 240-pin DDR3 DIMM sockets

DIMM_A1

DIMM_A2

DIMM_B1

DIMM_B2

Channel Sockets

Channel A DIMM_A1 and DIMM_A2

Channel B DIMM_B1 and DIMM_B2

1 ... 15 16 17 ... 70

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Asus A78M-A User Manual Page 16