User Guide

Hardware Installation
2-24
II. Speed: normally marked as -12, which means the clock cycle time is 12ns
and maximum clock of this SDRAM is 83MHz. Sometimes you can also find
the SDRAM marked as -67, which means maximum clock is 67mhz.
Caution: Some SDRAMs marked as -10 may
work fine with 100 MHz CPU clock, but not all
this kind of modules can work properly under
100MHz external clock. We suggest you
choose and install SDRAMs that match PC 100
specification if 100MHz or above CPU clock is
selected.
III. Buffered and non-buffered: This motherboard supports non-buffered
DIMMs. You can identify non-buffered DIMMs and buffered DIMMs
according to the position of the notch, following figure is for your reference:
buffered
non-buffered
Reserved
Because the positions are different, only non-buffered DIMMs can be
inserted into the DIMM sockets on this motherboard. Although most of
DIMMs on current market are non-buffered, we still recommand you to ask
your dealer for the correct type.
IV. 2-clock and 4-clock signals: Although both of 2-clock and 4-clock signals
are supported by this motherboard, we strongly recommand you to choose
4-clock SDRAM in consideration of reliability.
Tip: To identify 2-clock and 4-clock SDRAM, you
may check if there are traces connected to golden
finger pin 79 and pin 163 of the SDRAM. If there
are traces, the SDRAM is probably 4-clock;
Otherewise, it is 2-clock.
V. Parity: This motherboard supports standard 64 bit wide (without parity)
SDRAM.
There is no jumper setting required for the memory size or type. It is
automatically detected by the system BIOS.
Total Memory Size = Size of SIMM1 + Size of SIMM2 + Size of DIMM1 +
Size of DIMM2 + Size of DIMM3