Basics SDRAM DIMMs - 50
can be achieved by installing a 64 MB module in the upper
slot and a 64 MB module in the lower slot.
Any preinstalled RAM from Apple up to the amount of 64 MB
will be installed on the lower slot as this slot is more difficult
to access. If a BTO configuration is purchased with greater
than 64 MB of RAM, the top RAM slot will also be used.
The lower RAM expansion slot will only accommodate SO-
DIMMs which are 1.0 through 1.5 inches in height. A 2.0-inch
DIMM will not physically fit into the slot and cannot be used.
Electrically if a 128 MB DIMM existed which was smaller than
1.5 inches, it would work in the lower expansion slot.
EDO SO-DIMM RAM modules are not compatible with the
iMac computers. If a customer uses an EDO SO-DIMM, the
unit will boot fine but will not show any RAM increase in the
“About this Computer” window.