Memory Installation - VIA Technologies P4MA PRO User Manual

Installation

Memory Installation

The VIA P4MA PRO mainboard provides 2 sockets for 184-pin, 2.5V DDR
DIMM modules with 4 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 1~2).
DDR (Double Data Rate) SDRAM is similar to conventional SDRAM, but
doubles the rate of transfer by transfering data twice per cycle. This is achieved
by transfering data on both the rising and falling edges of the clock. Conven-
tional 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). 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.
M
DDR DIMM Sockets
(DDR 1~2)
2-5