Aaeon MB-562 Manual page 27

The MB-562 LPX Mainboard provides two 72-pin SIMM (Single In-
line Memory Module) sockets and one 168-pin DIMM (Dual-in-line
Memory Module). The SIMM supports either Fast Page Mode (FPM)
or Extended Data Output (EDO) DRAM with a speed of at least 70 ns.
The DIMM supported by this mainboard are always 64-bit wide
SDRAM (Synchronous DRAM). Depending on the combination of
modules you use, you can install from 8 MB to 128 MB of RAM.
Warning: SDRAM operates at 3.3V while SIMM (FPM/EDO) modules
operate at 5V. Unless you have 5V tolerance SDRAM, DO
NOT use SIMM and SDRAM DIMM at the same time.
NOTE 1: Pentium or compatible processors adopt 64 bit data bus.
Since 72-pin SIMM can only provide 32 bit data bus width,
two SIMM modules are required as one memory bank, and
both SIMMs must be the same size and type.
1. Ensure that all power sources are disconnected.
2. Slip the memory module into the socket at a 45 degree angle.
3. Push the module toward the vertical posts at both ends of the
socket until the module is upright and the retaining clips at both
ends of the module click into place. When positioned correctly, the
pins on top of the vertical posts should correspond to the circular
holes on the ends of the module.
4. Repeat steps 2 and 3 for each module you install.
NOTE 2: Do not insert any SIMM that contains more than 24
memory chips. SIMMs contain more than 24 chips exceed
the driving capability of new generation chipsets.
Chapter 2 Installation 19