Roundup: The Best Overclocking Software. By Pierre Dandumont 06. Be aware that changing timings on the fly is fairly dangerous, though, and that crashes should probably be expected as you tweak.

Description

This article is from the Macintosh hardware FAQ, by Elliotte Rusty Harold elharo@shock.njit.edu with numerous contributions by others.

Assuming you have a monitor and video card capable of supporting
multiple resolutions, you need the Apple Display Enabler or NEC's
DPI-on-the-fly extension to switch monitor resolutions without
rebooting your Mac. The Display Enabler works with Apple monitors
and video cards as well as some third party displays. Nec's
DPI-on-the-fly works with NEC and many other third party monitors
(most notably Sony monitors.) The Display Enabler requires System 7.1
or later. See
<URL:ftp://ftp.support.apple.com/pub/Apple%20SW%20Updates/Macintosh/Display%20%26%20Display%20Card%20Software/>
To get DPI-on-the-fly call the NEC BBS at (508) 635-4706. Finally if
you have a Radius Color Pivot or a Radius PrecisionColor interface card
then you can use the Radius Resolutions CDEV instead. See
<URL:ftp://ftp.radius.com/pub/radius/software/mac/RadiusResolutions/
Some later model monitors such as the NEC 4Fge and later model video
cards (like the high performance video cards in the PowerMacs) only
require the proper cable and do not need the Display Enabler or
DPI-on-the-Fly.

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