This document explains what type and speed of memory (RAM) is used in iMac (17-inch 1GHz) computers.
iMac (17-inch 1GHz) computers only work with PC2100, 2.5V, 266 MHz DDR SDRAM. The maximum installed RAM that can be used is 1 GB. RAM modules of 128 MB, 256 MB and 512 MB can be used in both slots.
There are two RAM slots in the iMac (17-inch 1GHz) computers. They are:
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 PC2100 266 MHz speed DDR SDRAM SO-DIMMs. When installing larger 256 MB or 512 MB DIMMs in this slot, use low-profile SO-DIMMs.
Always follow the installation instructions for memory and AirPort Extreme Card as written. They are available in technical document 26264, "iMac (17-inch 1GHz): Customer-Installable Parts Instructions". Never try 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 try to access the factory-only memory slot. Special seals and tools are required to access and reseal the computer successfully. If the computer is incorrectly resealed, it will be damaged. Any necessary repairs 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.