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2.4
System memory
2.4.1
Overview
The motherboard comes with four Double Data Rate II (DDR2) Dual Inline Memory
Modules (DIMM) sockets to support 240-pin DDR2 modules.
The figure illustrates the location of the DDR2 DIMM sockets:
P5BP-E/4L
P5BP-E/4L 240-pin DDR2 DIMM Sockets
2.4.2
Memory configurations
You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered ECC or non-ECC
DDR2-667/800 DIMMs into the DIMM sockets.
•
•
•
Recommended memory configurations
Mode
Number of memories
DIMM socket
DIMM_A1
DIMM_A2
DIMM_B1
DIMM_B2
•
•
2-10
®
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 Qualified Vendors List at the ASUS web
site.
When installing one or two DIMMs, install the DIMM(s) to the blue slots
(DIMM_A2/DIMM_B2).
Three DDR DIMMs intalled into any three memory sockets will function in
dual-channel asmmetric mode.
Single channel
mode
1
1
V
V
When the total size of memory module(s) installed per channel is the same
(A1+A2=B1+B2), the system will run in Dual Channel Interleaved mode
which provides optimum performance.
When the total size of each channel is not the same (A1+A2≠B1+B2), the
system will run in Dual Channel Asymmetric mode.
128 Pins
112 Pins
Dual channel
interleaved mode
2
4*
V
V
V
V
V
V
Chapter 2: Hardware setup
DIMM_A1
DIMM_A2
DIMM_B1
DIMM_B2
Dual channel
asymmetic mode
3
4*
V
V
V
V
V
V
V
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