TITLE
    Performa 450: Accelerators Versus Power Cache Cards (7/93)
Article ID:
Created:
Modified: 		12645
7/20/93
7/21/93
TOPIC

    Article Created: 20 July 1993


    Are accelerators and power cache cards the same? Can I run a 40MHz power cache
    on my Performa 450 (68030 @ 25MHz) or do I need a 40MHz accelerator, too? Will
    it speed up programs like CAD programs?

DISCUSSION


    Cache cards and Accelerators are not the same thing. Cache cards contain SRAM;
    Static RAM. This RAM is used only by the CPU and has a very high transfer rate
    between the CPU and itself. Cache memory will increase the speed of most
    applications, because the CPU stores commands in this ram and doesn't have to
    fetch instructions by way of the CPU BUS. This increases your speed where tasks
    are repeated. For example, displaying pictures. The application reads the data
    from the drive, then has to do repetitive processing to display the picture.

    Accelerator Cards replace your current CPU (in your case a 25MHz 68030). By
    increasing the speed of your CPU, you speed up the processing time. An
    important thing to remember however, is that when comparing speeds of different
    accelerator cards make sure the CPU is the same. A 25MHz 68040 is MUCH faster
    than a 25MHz 68030.

Document Information
Product Area: Computers
Category: Macintosh Performa 200 through 640 Series
Sub Category: Macintosh Performa 400-405-410-430-450
Keywords:

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