PCchips M927 Series, User Manual

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2: Mainboard Installation
Installing Memory Modules
This mainboard accommodates 168-pin 3.3V/184-pin 2.5V
unbuffered SDRAM memory modules. The memory chips must be
standard or registered SDRAM (Synchronous Dynamic Random
Access Memory).
The CPU supports 100MHz system bus. The SDRAM DIMMs
and DDRs can synchronously work with 100 MHz or operates over
a 266 MHz system bus.
You must install at least one memory module in order to work out
this mainboard,
either SDRAM or DDR SDRAM, but you can’t
use them simultaneously.
DDR SDRAM provides 800 MBps or 1 GBps data transfer
depending on whether the bus is 100 MHz or 266 MHz. It doubles
the rate to 1.0 GBps and 2.1 GBps by transferring data on both the
rising and falling edges of the clock. DDR SDRAM uses additional
power and ground lines and requires 184-pin 2.5V unbuffered
DIMM module rather than the 168-pin 3.3V unbuffered DIMMs
used by SDRAM.
11
DIMM
DDR