User guide

1-14 Chapter 1: Product introduction
1.7 System memory
1.7.1 Overview
The motherboard comes with two Double Data Rate 2 (DDR2) Dual Inline Memory
Modules (DIMM) sockets.
A DDR2 DIMM 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:
M3N78-AM
M3N78-AM 240-pin DDR2 DIMM sockets
DIMM_A1 DIMM_B1
Channel Sockets
Channel A DIMM_A1
Channel B DIMM_B1