2.4System memory

2.4.1Overview

The motherboard comes with four 240-pin 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 following figure illustrates the location of the sockets:

DIMM A1

DIMM A2

DIMM B1

DIMM B2

P5GD2

P5GD2 184-Pin DDR DIMM sockets

Channel

Sockets

 

 

Channel A

DIMM_A1 and DIMM_A1

 

 

Channel B

DIMM_B1 and DIMM_B2

 

 

2.4.2Memory Configurations

You may install 256 MB, 512 MB and 1 GB unbuffered non-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).

•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 DDR2-533 Qualified Vendors List on the next page for details.

•Due to chipset resource allocation, the system may detect less than 4 GB of system memory when you installed four 1 GB DDR2 memory modules.

•Due to chipset limitation, DIMM modules with 128 Mb memory chips or double-sided x16 memory chips are not supported in this motherboard.

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Chapter 2: Hardware information