Asus A7V8X User Manual download pdf (Page 32)

2-6

Chapter 2: Hardware information

2.5 System memory

2.5.1 Overview

The motherboard comes with three Double Data Rate (DDR) Dual Inline

Memory Module (DIMM) sockets. These sockets support up to 3GB

system memory using 184-pin unbuffered non-ECC PC3200/PC2700/

2100/1600 DIMMs. (Note: DDR400 supports one (1) socket only. DDR333

supports two (2) sockets only.)

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. For example, a

200MHz DDR DIMM will support a 100MHz memory bus, and a 266MHz

DDR DIMM will support a 133MHz memory bus.

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.

DDR Data Transfer Rate DDR Base Frequency

400MHz 200MHz

333MHz 166MHz

266MHz 133MHz

200MHz 100MHz

A7V8X

A7V8X 184-Pin DDR DIMM Sockets

80 Pins

104 Pins

A DDR DIMM is keyed with a notch so that it fits in only one direction.

DO NOT force a DIMM into a socket to avoid damaging the DIMM.

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Asus A7V8X User Manual Page 32