Memory; Introduction To Ddr Sdram - MSI 645 Ultra Manual

Memory

The mainboard provides 3 slots for 184-pin, 2.5V DDR DIMM with 6
memory banks. You can install PC1600/PC2100 DDR SDRAM modules on the
DDR DIMM slots (DDR 1~3). To operate properly, at least one DIMM module
must be installed.

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 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, worksta-
tions and servers.
Hardware Setup
DDR DIMM Slots
(DDR 1~3)
2-5