iMac (Flat Panel) computers only work with PC133 SDRAM. The maximum installed RAM that can be used is 1 GB. RAM modules of 128 MB, 256 MB, and 512 MB sizes can be used in both slots.
There are two RAM slots in the iMac (Flat Panel) computers. They are:
- A user-accessible 144-pin SO-DIMM slot.
- An internal (factory-installed) 168-pin DIMM slot
The Apple System Profiler will show the two different types of slots and what amount of RAM is installed there.
The user-accessible slot requires PC133 speed RAM. PC100 RAM is not to be used with iMac (Flat Panel) computers and may create performance and reliability issues.
Always follow the upgrade instructions for Memory and AirPort card installation as written. Never attempt to remove screws that are not listed in the upgrade instructions.
Warning: While you may add or change memory in the SO-DIMM slot, do not attempt to access the factory-only memory slot. Special seals and tooling are required to access and reseal the computer successfully. If the computer is incorrectly resealed, damage to the computer will result and this damage would not be covered under warranty.
The services of an Apple authorized Service Provider or Apple itself is required to install additional memory into the factory-only accessible memory slot. The service and support information that came with your computer provides instructions on locating an Apple Authorized Service Provider or contacting Apple for this service.
When installing any additional memory you risk damaging your computer. Carefully follow all instructions to avoid damage to your computer when installing memory into the SO-DIMM slot. Any damage resulting from your installation is not covered by the limited warranty on your computer. See an Apple Reseller or Apple Authorized Service Provider for additional information about this or any other warranty question. Apple does not provide telephone support for memory upgrades.
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