Installing Memory Modules
The mainboard has two 168-pin and 184-pin DIMM sockets for SDRAM/DDR
(Double Data Rate) SDRAM system memory modules.
The CPU supports 400MHz system bus. The SDRAM DIMMs can synchro-
nously work with 133 MHZ memory bus and DDRs can operate over a 266
MHz memory bus.
Note:
Please set the correct jumper settings for JP1 and JT1~JT10 first as de-
scribed on page 7 of this chapter.
SDRAM provides 800 MB/s or 1 GB/s data transfer rate corresponding with
the bus 100 MHz or 133 MHz. It doubles the rate to 1.6 GB/s and 2.1 GB/s 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.
Installation Procedure
You must install at least one memory
module in order to use the main-
board.
Note
: You cannot use DDR
SDRAM and SDRAM
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:
14
