2.5System memory

2.5.1 Overview

The motherboard comes with four Double Data Rate (DDR) Dual Inline Memory Module (DIMM) sockets. These sockets support up to 4GB system memory using 184-pin unbuffered non-ECC PC3200/2700/PC2100 DDR DIMMs and allow up to 6.4 GB/s data transfer rate.

The following figure illustrates the location of the DDR DIMM sockets.

P4P800

DIMM A1

DIMM A2

DIMM B1

DIMM B2

 

 

 

80 Pins

 

 

 

104 Pins

P4P800 184-Pin DDR DIMM Sockets

Notes on DDR technology

The DDR SDRAM technology evolved from the mainstream PC66, PC100, PC133 memory known as Single Data Rate (SDR) SDRAM. DDR memory however, has the ability to perform two data operations in one clock cycle, thus providing twice the throughput of SDR memory.

A DDR DIMM has the same physical dimensions as an SDR DIMM, but it has a 184-pin footprint compared to the 168-pin of the SDR DIMM. Also, a DDR DIMM is single notched while an SDR DIMM is double notched.

Therefore, a DDR DIMM is not backward compatible with SDR, and should be installed only in a socket specially designed for DDR DIMMs.

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Chapter 2: Hardware information