Asus M2N-LR SATA User Manual - Page 31

System memory

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2.4 System memory 2.4.1 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: M2N-LR/SATA ® 128 Pins 112 Pins DIMM_B2 DIMM_A2 DIMM_B1 DIMM_A1 M2N-LR/SATA 240-pin DDR2 DIMM Sockets Channel Channel A Channel B Sockets DIMM_A1 and DIMM_A2 DIMM_B1 and DIMM_B2 2.4.2 Memory configurations You may install 64 MB, 128 MB, 256 MB, 512 MB, or 2 GB unbuffered ECC DDR2 DIMMS into the DIMM sockets using the memory configurations in this section. • For dual-channel configuration, the total size of memory module(s) installed per channel must be the same for better performance (DIMM_A1+DIMM_ A2=DIMM_B1+DIMM_B2). • Due to chipset resource allocation, the system may detect less than 8 GB of system memory when you installed four 2 GB DDR2 memory modules. • Always install DIMMs with the same CAS latency. For optimum compatibility, we recommend that you obtain memory modules from the same vendor. Refer to the DDR2 800 Qualified Vendors List at the ASUS web site. 2-12 Chapter 2: Hardware information

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2-±2
Chapter 2: Hardware information
2.4
System memory
2.4.1
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 A
DIMM_A1 and DIMM_A2
Channel B
DIMM_B1 and DIMM_B2
2.4.2
Memory configurations
You may install 64 MB, 128 MB, 256 MB, 512 MB, or 2 GB unbuffered ECC DDR2
DIMMS into the DIMM sockets using the memory configurations in this section.
•
For dual-channel configuration, the total size of memory module(s) installed
per channel must be the same for better performance (DIMM_A1+DIMM_
A2=DIMM_B1+DIMM_B2).
•
Due to chipset resource allocation, the system may detect less than
8 GB
of system memory when you installed four 2 GB DDR2 memory modules.
•
Always install DIMMs with the same CAS latency. For optimum
compatibility, we recommend that you obtain memory modules from the
same vendor. Refer to the DDR2 800 Qualified Vendors List at the ASUS
web site.
M2N-LR/SATA
M2N-LR/SATA 240-pin DDR2 DIMM Sockets
DIMM_A2
DIMM_B1
DIMM_A1
DIMM_B2
112 Pins
128 Pins