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1 overview – Asus P4G8X User Manual

Page 37

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ASUS P4G8X series motherboard user guide

2-11

2.5

System 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 ECC or non-ECC PC2100/
PC1600 DDR DIMMs, and allow up to 4.2GB/s data transfer rate.

The following figure illustrates the location of the 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.

P4G8X

®

P4G8X 184-Pin DDR DIMM Sockets

80 Pins

104 Pins

DIMM_A1

DIMM_B1

DIMM_A2

DIMM_B2

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