Computer Computer Accessories User Manual

Chapter 2

2-4

Memory

The mainboard provides 2 slots for 184-pin, 2.5V unbuffered DDR DIMM

with 4 memory banks. You can install PC1600 or PC2100 DDR SDRAM mod-

ules on the DDR DIMM slots (DDR 1~2). To operate properly, at least one

DIMM module must be installed.

Note: The DDR DIMM slots DO NOT support PC2700 modules.

Introduction to DDR SDRAM

DDR (Double Data Rate) SDRAM is similar to conventional SDRAM,

but doubles the rate by transferring data twice per cycle. It uses 2.5 volts as

opposed to 3.3 volts used in SDR SDRAM, and requires 184-pin DIMM mod-

ules rather than 168-pin DIMM modules used by SDR SDRAM. Two types of

DDR SDRAM are available at the time of writing: PC1600, PC2100.

The following table shows the clock and peak bandwidth of each type of

DDR SDRAM module:

PC2100 PC1600

(DDR266) (DDR200)

Clock 133MHz 100MHz

Peak

Bandwidth 2133MB/s 1600MB/s