Abit IT5E Series, Руководство пользователя, Страница: 29 / 98

Installing the Mainboard 2-17
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<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 FR 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:
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3.3V UNBUFFERED DIMM
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3.3V BUFFERED DIMM
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5V UNBUFFERED DIMM
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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:
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The maximum memory size is 128M bytes.
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