Installing Memory Modules
This mainboard accommodates 168-pin 3.3V/184-pin 2.5V unbuffered
SDRAM memory modules.
The CPU supports 100MHz system bus. The SDRAM DIMMs and DDRs can
synchronously work with 100 MHz or operates over a 133 MHz system bus.
DDR SDRAM provides 800 MBps or 1 GBps data transfer depending on
whether the bus is 100 MHz or 133 MHz. It doubles the rate to 1.6 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.
Do not remove any memory module from its antistatic packaging until
you are ready to install it on the mainboard. Handle the modules only by
their edges. Do not touch the components or metal parts. Always wear
a grounding strap when you handle the modules.
Note: You must install at least one memory module in order to have the main-
board work properly, either SDRAM or DDR SDRAM, but you can’t
use them simultaneously.
Refer to the following to install the memory modules.
1. Push the latches on each side of the DIMM slot down.
2. Align the memory module with the slot. The DIMM slots are keyed
with notches and the DIMMs are keyed with cutouts so that they can
only be installed correctly.
3. Check that the cutouts on the DIMM module edge connector match
the notches in the DIMM slot:
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