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1-14 Chapter 1: Product introduction
1.7.2 Memory congurations
You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered ECC / non-ECC
DDR2 DIMMs into the DIMM sockets.
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 A DIMM_A1 and DIMM_A2
Channel B DIMM_B1 and DIMM_B2
Recommended memory congurations
Mode
Sockets
DIMM_A1 DIMM_B1 DIMM_A2 DIMM_B2
Single-Channel
– Populated – –
Populated – – –
Dual-channel (1) Populated Populated – –
Dual-channel (2) Populated Populated Populated Populated
R
M3N78-VM
M3N78-VM 240-pin DDR2 DIMM Sockets
DIMM_B1
DIMM_A2
DIMM_B2
DIMM_A1
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