Memory for your computer is provided in packages called Dual Inline Memory Modules (DIMMs). Adding dynamic random-access memory (DRAM) DIMMs increases your computer’s memory. The DIMMs must be the correct type for your computer, and can be installed one-at-a-time. For best performance, however, the DIMMs should be installed in pairs of the same size into paired slots in your computer. Installing a cache DIMM can also increase your computer’s performance. The memory used to display images on the screen (called video RAM, or VRAM) can also be expanded by installing DIMMs.

WARNING Although instructions for installing DIMMs are provided in the Technical Information booklet that came with your computer, Apple Computer recommends that you have an Apple-certified technician install additional DRAM, VRAM, or cache DIMMs. Consult the service and support information that came with your computer for instructions on how to contact an Apple-authorized service provider or Apple for service. If you install additional DIMMs yourself, you risk damaging your equipment and this damage is not covered by the limited warranty on your computer. See an Apple-authorized dealer or service provider for additional information about this or any other warranty question.

It is very important that the DIMMs be correctly installed in your Power Macintosh, because incorrect installation can result in errors, unpredictable results, and damage to your equipment and data.

Installing internal drives

Your Macintosh can hold up to four internal storage devices. Possible configurations could include a floppy disk drive, a CD-ROM drive, and two hard disk drives (several capacities are available) or a CD-ROM drive, a floppy disk drive, a removable cartridge drive, and a digital audio tape (DAT) drive. Depending on the configuration you purchased, these drives may already be installed. If you want to add an internal drive to your Macintosh, see your Apple-authorized dealer. For more information about internal drives, see the Technical Information booklet that came with your Macintosh.

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Apple 132 Series appendix Installing internal drives