AOpen MX64 User Manual page 24

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. The 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 DIMMs
available in the current market are non-buffered, we still recommend you
ask your dealer for the correct type.
IV. 2-clock and 4-clock signals: Although both 2-clock and 4-clock signals
are supported by this motherboard, we strongly recommend you choose 4-
clock SDRAM for its reliability.
V. Parity: This motherboard supports standard 64 bit wide (without parity) and
72-bit wide (with parity) DIMM modules.
VI. SPD support: The BIOS will automatically detect DIMMs with SPD, and set
to the appropriate timing. DIMMs without SPD are still able to work fine on
this board, but the BIOS POST screen will give you a warning message that
you use a DIMM without SPD.
There is no jumper setting required for the memory size or type. It is
automatically detected by the system BIOS, and the total memory size is all of
them added together.
Caution: Some SDRAMs marked as -10 may work
fine with 100 MHz CPU clock, but not all of 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.
non-buffered
Tip: To identify 2-clock and 4-clock SDRAM, you may
check if there are traces connected to the golden finger
pins 79 and 163 of the SDRAM. If there are traces, the
SDRAM is probably 4-clock; Otherwise, it is 2-clock.
Hardware Installation
2-17