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This article provides DRAM and VRAM information for the original Bondi Blue iMac.
DISCUSSION
(This information is gleaned from the Info Center online help system, which is located on your computer's hard disk.)
iMac Memory
The iMac contains two types of memory: dynamic random-access memory (DRAM) and video memory (VRAM). You can add DRAM or VRAM to your computer in packages called Dual Inline Memory Modules, or DIMMs.
Figure 1 shows the locations of memory slots on the logic board. See the sections that follow for important information about DRAM and video memory.
Figure 1 iMac logic board memory locations
A-Video memory slot
B- Lower DRAM slot (hidden under the processor card)
C- Upper DRAM slot
DRAM Configurations
You can increase your computer's DRAM up to 128 megabytes (revision /A iMac) or 256 megabytes (revision /B iMac and the 266MHz iMac) by adding Dual Inline Memory Modules (DIMMs) to the 2 DIMM slots on the main logic board.
Note: Although revision /A iMac computers may work with larger capacity SO-DIMM's than stated, these larger sizes weren't available for official testing at the time of product development, and so therefore aren't included.
Important: This computer uses Synchronous Dynamic Random-Access Memory (SDRAM) DIMMs. DIMMs from older Macintosh computers are not compatible with iMac and should not be used even though they may fit into the RAM DIMM slots.
There are two slots where memory can be added--an upper slot and a lower slot. You should install memory only in the upper slot. Have an Apple-authorized dealer install additional memory in the lower slot.
Video Memory Configurations
The iMac comes with 2 MB of video memory built into the logic board and a video memory expansion slot that allows you to expand video memory up to 6 MB. You may want to add more video memory for better performance on applications that use 3D graphics.
The expansion slot accepts a 2 MB or 4 MB Synchronous Graphic RAM (SGRAM) SO-DIMM.
Important:
Use only SGRAM SO-DIMMs.