Memory Installation - VIA Technologies P4XB-S User Manual

The VIA P4XB series mainboards provide 3 sockets for 184-pin, 2.5V DDR
DIMM with 6 memory banks. To operate properly, at least one DIMM module
must be installed.
You can install PC1600/PC2100 DDR SDRAM modules on the DDR DIMM
slots (DDR 1~3).
DDR266 (Double Data Rate) SDRAM is similar to conventional SDRAM, but
doubles the rate of trans-
fer by transfering data
twice per cycle. This is
achieved by transfering
data on both the rising
and falling edges of the
clock. Conventional
SDRAM only uses the
rising edge of the clock
t o t r a n s f e r d a t a .
Therefore, conventional
SDRAM is called SDR
( S i n g l e D a t a R a t e )
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. DDR266 SDRAM is also known as SDRAM-II, DDR DRAM and
DSDRAM (Double-Speed DRAM). Two types of DDR are available currently:
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 solu-
tion for high performance PC, workstations and servers.

Memory Installation

2-11
Installation
DDR DIMM Slots
(DDR 1~3)