2-16 Chapter 2
¡i
168-pin DIMM modules specifications
¡j
According to the standards defined by JEDEC, there are a lot of
different types of specifications for 168-pin DIMM sockets. Here
are the possible types:
l 3.3V UNBUFFERED DIMM
l 3.3V BUFFERED DIMM
l 5V UNBUFFERED DIMM
l 5V BUFFERED DIMM
These types of DIMM modules differ not only by the electrical
design, but also by their architecture. So, if you buy different
types of DIMM modules, you will not be able to insert them in the
DIMM sockets. Currently, the standard for PC is 3.3V
UNBUFFERED DIMM, which is the standard supported by this
series.
After installing the DRAM, the BIOS of the mainboard will automatically
detect the size of the memory installed on the mainboard. Below is a list of all the
possible situations:
Scenario 1: You use only 72-pin SIMM modules:
l
The maximum memory size is 128M bytes.
l
Support possible for single density or double density memory
modules.
l Memory modules supported: 1Mx32 ¡i 4M ¡j, 2Mx32
¡i 8M ¡j, 4Mx32 ¡i 16M ¡j or 8Mx32 ¡i 32M ¡j.
l ¡i SIMM1 and SIMM2 ¡j is the first pair, ¡i SIMM3 and
SIMM4 ¡j is the second pair. Usually, you first insert the first
pair, than the second pair, but it is possible to do the reverse.
l
You can also directly refer to table 2-1.
Scenario 2: You use only 168-pin DIMM modules:
l
The maximum memory size is 128M bytes.
l
Support possible for single density or double density memory
modules.
l Memory modules supported: 1Mx64 ¡i 8M ¡j, 2Mx64
¡i 16M ¡j or 4Mx64 ¡i 32M ¡j.
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