2.4System memory

2.4.1Overview

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:

 

DIMM_A1

 

DIMM_A2

P5BP-E/4L

DIMM_B1

 

DIMM_B2

128 Pins

112 Pins

P5BP-E/4L 240-pin DDR2 DIMM Sockets

2.4.2Memory 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.

• 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.

Recommended memory configurations

Mode

Single channel

Dual channel

 

Dual channel

 

mode

 

interleaved mode

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

 

 

 

 

 

 

 

 

 

 

•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.

2-10

Chapter 2: Hardware setup