TITLE
    iMac: Type of Memory to Order to Upgrade RAM and VRAM
Article ID:
Created:
Modified: 		58007
8/13/98
6/8/00
TOPIC

    What type of random access memory (RAM) and video memory (VRAM) are used in iMac?

DISCUSSION

    Note: The information in this article is valid for the original iMac only. Refer to TIL article 58466: " iMac (Slot Loading): Memory Upgrades " for information on upgrading that computer.

    SUMMARY
    The iMac has two memory expansion slots. To expand the built-in memory (DRAM) in your iMac, use the following information when ordering memory:
    • DRAM Form Factor - SO-DIMM
    • DRAM Type - SDRAM, 3.3 volt (V), unbuffered, 64-bit wide, 144-pin, with Serial Presence Detect
    • DRAM Speed - 100 MHz, 10 ns (or faster meaning a lower number)
    • Max size of SO-DIMM Supported - 64 MB per slot (revision /A iMac), or 128 MB per slot (revision /B iMac and 266 megahertz iMac)
    • Total DRAM Supported - 128 MB with both slots filled (revision /A iMac), or 256 MB (/B iMac, 266 MHz, and 333 MHz iMac)

    Note: Although /A iMac computers may work with higher 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.

    Refer to TIL article 43012: " iMac: Installing Memory (1 of 2) " for specific instructions on installing memory into iMac.

    To expand the video memory (VRAM) in your iMac, use the following information when ordering VRAM:
    • Form Factor - SO-DIMM
    • RAM Type - SGRAM

Document Information
Product Area: iMac
Category: iMac Hardware
Sub Category: Features

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