Asus M3A78-VM - Manual (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 figure illustrates the location of the DDR2 DIMM sockets:
Channel Sockets
Channel 1 DIMM_A1 and DIMM_A2
Channel 2 DIMM_B1 and DIMM_B2
M3A78-VM
M3A78-VM 240-pin DDR2 DIMM sockets
DIMM_A
1
DIMM_B
1
DIMM_A
2
DIMM_B
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
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