AOpen AX5TC, Руководство пользователя

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Hardware Installation
2-23
DIMM modules can be identified by following factors:
I. Size: single side, 1Mx64 (8MB), 2Mx64 (16MB), 4Mx64 (32MB), 8Mx64
(64MB), 16Mx64 (128MB), and double side, 1Mx64x2 (16MB), 2Mx64x2
(32MB), 4Mx64x2 (64MB), 8Mx64x2 (128MB).
Tip: Here is a trick to check if your DIMM is
single-side or double-side -- if there are traces
connected to golden finger pin 114 and pin 129 of
the DIMM, the DIMM is probably double-side;
otherwise, it is single-side. Following figure is for
your reference.
168
85
Pin 129
Pin 114
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:
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.