Memory; Introduction To Ddr Sdram - MSI 848P Neo-S User Manual

The mainboard provides 2 slots for 184-pin, 2.5V DDR DIMM modules
and supports the memory size up to 2 GB without ECC,. You can install DDR266/
DDR333/DDR400 DDR SDRAM modules on the DDR DIMM slots. 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. Three types of
DDR are available at the time of writing: DDR266, DDR333 & DDR400. DDR266
DDR SDRAM running at 133MHz will produce about 1.6GB/s memory
bandwidth. DDR333 running at 166MHz will produce 2.1GB/s memory
bandwidth. DDR400 is also available with bandwidith up to 3.2GB/s for single-
channel mode or with 6.4GB/s for dual-channel mode. High memory band-
width makes DDR an ideal solution for high performance PC, workstations and
servers.

Memory

DIMM1-2
Hardware Setup
2-7