Energy consumption of Apple Macintosh computers

Jacob R. Lorch and Alan Jay Smith

Abstract

The utility of a portable computer is critically dependent on the period it can be used while running off the battery. In this paper, we present a study of power consumption in Apple Macintosh computers. We measure the existing power consumption for each system component using built-in measuring tools. Since total power consumption is a function of user workload, we use eight user workload traces to determine power use as observed in practice. Apple currently implements some simple power-saving features, and the effectiveness of those features is estimated; we find typical power savings of 41-66%. After the use of basic power-saving techniques, we find that the major power users are the backlight (25-26%), the CPU (9-25%), the display (4- 17%), the video circuitry (6-10%), and the hard drive (4-9%). We then evaluate possible changes in system hardware and software with regard to the power savings they might offer.

Details

Publication typeArticle
Published inIEEE Micro
Pages54–63
Volume18
Number6
PublisherInstitute of Electrical and Electronics Engineers, Inc.
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