Asus M3A78 User Manual download pdf (Page 26)

1-14 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 1 DIMM_A1 and DIMM_A2

Channel 2 DIMM_B1 and DIMM_B2

1.7.2 Memory congurations

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

DIMMs into the DIMM sockets.

Recommended memory congurations

Sockets

Mode DIMM_A1 DIMM_B1 DIMM_A2 DIMM_B2

Single-Channel

– Populated – –

Populated – – –

Dual-channel (1) Populated Populated – –

Dual-channel (2) Populated Populated Populated Populated

M3A78 240-pin DDR2 DIMM Sockets

M3A78

DIMM_B1

DIMM_A2

DIMM_B2

DIMM_A1

128 Pins

112 Pins

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Asus M3A78 User Manual Page 26