System Memory; Overview; Memory Configurations - Asus M3A78 Owner's Manual

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 figure illustrates the location of the DDR2 DIMM sockets:
M3A78 240-pin DDR2 DIMM Sockets
Channel
Channel 1
Channel 2
1.7.2

Memory configurations

You may install 256MB, 512MB, 1GB, and 2GB unbuffered ECC/non-ECC DDR2
DIMMs into the DIMM sockets.
Recommended memory configurations
Mode
Single-Channel
Dual-channel (1)
Dual-channel (2)
1-14
R
M3A78
Sockets
DIMM_A1 and DIMM_A2
DIMM_B1 and DIMM_B2
Sockets
DIMM_A1
–
Populated
Populated
Populated
DIMM_B1 DIMM_A2
Populated –
– –
Populated –
Populated Populated
DIMM_B2
–
–
–
Populated
Chapter 1: Product introduction