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3.6 DRAM Installation
The S1672 uses a 64-bit data path from memory to CPU and can
accommodate up to 768 MB of RAM. The mainboard supports
standard, EDO (Extended Data Out) and ECC(Error Correcting Code)
72 pin SIMMS . All installed memory will be automatically detected so
there is no need to set jumpers.
wSIMM modules must be installed in pairs.
wEach pair of SIMMs must be of the same size and type.
wThe mainboard supports 1, 2, 4, 8, 16x32 or 32MBx32 SIMMS.
wThe table on the following page shows some of the available memory
configurations.
3.7 Voltage ID for Older Pentium Pro CPU's: J23
Most Pentium Pro CPU's will program the VRM to output
the correct voltage it requires, so these jumper are not important
and should be left open. Some early versions of the Pentium Pro
cannot program the VRM so you have to set these jumper manually.
J23 has eight pins and are numbered as follows.
5
6 7 8
1
2 3 4
S1672-ATX-001 http://www.tyan.com
Pin #
4--8
3-7
3.5V
on
on
3.4V
on
on
3.3V
on
on
3.2V
on
on
3.1V
on
off
3.0V
on
off
2.9V
on
off
2.8V
on
off
2.7V
off
on
2.6V
off
on
2.5V
off
on
2.4V
off
on
2.3V
off
off
2.2V
off
off
2.1V
off
off
Default off
off
13
2-6
1-5
on
on
on
off
off
on
off
off
on
on
on
off
off
on
off
off
on
on
on
off
off
on
off
off
on
on
on
off
off
on
off
off
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