User Guide

Basics Memory - 48
The lower RAM expansion slot will only accommodate SO-
DIMMs that are 1.0 inch to 1.5 inches in height. A 2.0-inch
DIMM will not physically fit into the slot and cannot be used.
If a 128 MB DIMM existed that 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.
Note:
If EDO memory is mixed with SDRAM memory, the
computer will sound two beeps at startup. (See “Power-On
Self Test” in Troubleshooting for more information.)
SGRAM Video Memory
The iMac logic board comes with 2 MB of Synchronous
Graphic RAM (SGRAM) video memory soldered on. The logic