1-16 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 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:
1.7.2 Memory congurations
You may install 256 MB, 512 MB, 1 GB and 2 GB unbuffered non-ECC DDR2
DIMMs into the DIMM sockets.
• For dual-channel conguration, the total size of memory module(s) installed
per channel must be the same (DIMM_A1 = DIMM_B1).
• When installing two or three DDR2 DIMM modules for single-channel
conguration, this motherboard only supports single-sided memory
modules.
• When installing four DDR2 DIMM modules, install the single-sided memory
modules.
• When installing four single-sided DDR2 DIMM modules, the transfer rate
reduces to 533 MHz.
• Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules from the
same vendor. Refer to the DDR2 Qualied Vendors List on next page for
details.
Channel Sockets
Channel A DIMM_A1 and DIMM_A2
Channel B DIMM_B1 and DIMM_B2
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