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Hardware Installation
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.
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:
Reserved
buffered
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.
V. Parity: This motherboard supports standard 64 bit wide (without parity)
SDRAM.
Because Pentium CPU has 64 bit bus width, the SIMM sockets are arranged in
two banks of two sockets each, they are Bank0 and Bank1. Both SIMMs in each
bank must be in the same size and type. It is allowed to have different speed and
type in different bank, for example, 70ns FPM in one bank and 60ns EDO in
another bank, in such case, each bank is independently optimized for maximum
performance. The memory timing requires at least 70ns fast page mode DRAM
chip, but for optimum performance, 60ns EDO DRAM is recommended.
Warning: The default memory timing setting is 60ns to
obtain the optimal performance. Because of the
specification limitation, 70ns SIMM is recommended to
be used only for CPU external clock 60MHz.
2-24
non-buffered
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.
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