MSI MS-9105 Instruction Manual download pdf (Page 21)

Hardware Setup

2-5

The mainboard provides 4 sockets for 184-pin DDR DIMM (Double In-

Line Memory Module) modules and supports a maximum memory size of 4GB.

Memory

DDR DIMM Slots

(DIMM 1~4)

Introduction to DDR SDRAM

You can install PC1600/PC2100 DDR SDRAM modules on the DDR

DIMM slots (DIMM 1~4).

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

but doubles the rate by transfering data twice per cycle. It transfers data on

both the rising and falling edges of the clock. Conventional SDRAM only

uses the rising edge of the clock to transfer data. Therefore, conventional

SDRAM is called SDR (Single Data Rate) SDRAM.

DDR SDRAM uses 2.5 volts as opposed to 3.3 volts used in SDR

SDRAM, and requires 184-pin DIMM modules rather than 168-pin DIMM

modules used by SDR SDRAM. DDR SDRAM is also known as SDRAM-II,

DDR DRAM and DSDRAM (Double-Speed DRAM).

Two types of DDR are available at the time of writing: PC1600 & PC2100.

PC1600 DDR SDRAM running at 100MHz will produce about 1.6GB/s memory

bandwidth. PC2100 running at 133MHz will produce 2.1GB/s memory

bandwidth. High memory bandwidth makes DDR an ideal solution for high

performance PC, workstations and servers.

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MSI MS-9105 Instruction Manual Page 21