Abit AR5 User Manual page 25

Installing the Mainboard
l DIMM1 is the first pair, DIMM2 is the second pair. Usually,
you first insert modules in DIMM1 socket, than in DIMM2
socket, but it is possible to do the reverse.
l You can also directly refer to table 2-2.
Scenario 3: You use 72-pin SIMM modules and 168-pin DIMM modules:
l The maximum memory size is: 128M Bytes.
l Support possible for single density or double density memory
l Memory modules supported: Refer to case 1 and case 2 above.
l Support possible for mixed use of single density and double
l Since there is a lot of possible configurations, no table is given.
modules.
density modules.
2-17