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The Greening of IT
112 How Companies Can Make a Difference for the Environment

and Remote Wake are required to leave an external port on the Internet-
facing side of the gateway active, so it can route traffic to the snoozing
system. Intel and its partners state that you can use Remote Wake to let a
computer sleep unless there’s a download needed, or a user wants to access
files (like media to stream) from a home computer, or a call is incoming via
VoIP. Remaining in a standby instead of active state can reduce usage by
hundreds of watts a day for a computer that’s normally left on in a full-power
mode with its monitor off.
Standby modes need to be made more efficient, too. The standby modes of
all home electronics, including televisions, toaster ovens with electronic dis-
plays, and transformers for DC conversion consume hundreds of terawatt
hours per year, equivalent to the output of hundreds of power plants. Standby
power can’t be eliminated entirely, of course, but newer equipment and
smarter engineering can drop standby power use by 90 percent or more.

SPECpower_ssj2008
Copyright 2007 Standard Performance Evaluation Corporation

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© 2009 Standard Performance Evaluation Corporation (SPEC), reprinted with permission.
Figure 7.1 SPEC power and performance for Fujitsu-Siemens RX300 S3