Specifications

2-18 Chapter 2
l【SIMM1 and SIMM2】use the same memory type, and
【SIMM3 and SIMM4】can use the same type, or a
different type, in order to permit you to obtain the best
speed configuration for each “single” pair, and to make
the system work at its maximum capacity. If one
memory pair is slower, it will have no influence on the
pair whose speed is higher.
168-pin DIMM modules are 64 bit, so you can use single
modules. On the IT5V mainboard, these modules can support
not only EDO and FP DRAM, but also Synchronous DRAM
memory configurations. The IT5H mainboard does not support
SDRAM.
When you install DIMM modules on the mainboard, you don’t have to
setup anything, just be sure that you use 3.3V unbuffered 168-pin DIMM
modules, and insert them in the memory socket.
【168-pin DIMM modules specifications】
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:
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