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Chapter 2: Hardware setup2-10
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 gure illustrates the location of the DDR2 DIMM sockets:
2.4.2 Memorycongurations
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.
• 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 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.
®
P5BP-E/4L
P5BP-E/4L
240-pin DDR2 DIMM Sockets
DIMM_A2
DIMM_B1
DIMM_B2
DIMM_A1
112 Pins
128 Pins
Recommendedmemorycongurations
• 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.
Mode
Single channel
mode
Dual channel
interleaved mode
Dual channel
asymmetic mode
Number of memories 1 1 2 4* 3 4*
DIMM socket
DIMM_A1 V V V
DIMM_A2 V V V V V
DIMM_B1 V V
DIMM_B2 V V V V V