Abit SM5 User Manual page 25

Installing the Mainboard
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
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
l You can also directly refer to table 2-1.
Scenario 2: You use only 168-pin DIMM modules: (the SM5-A do not support this
feature)
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 .
l DIMM1 is the first pair, DIMM2 is the second pair. Usually, you
first insert modules in DIMM1 socket, than in DIMM2 socket, but
it is possible to do the reverse.
l You can also directly refer to table 2-2.
Scenario 3: You use 72-pin SIMM modules and 168-pin DIMM modules: (the
SM5-A do not support this feature)
l The maximum memory size is: 128M Bytes.
l 5V UNBUFFERED DIMM
l 5V BUFFERED DIMM
modules.
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.
2-17