a word of caution for those who run dual monitors: don't use this trick. doing so will result in an immediate GSoD.
instead, use atitraytools and enable its auto overclocking feature, and let that handle 2D/3D profiles.
and i also have to question this profile trick's stability. i did the exact same thing on my old 4850 two years ago, when i was trying to get around the dual monitors+overclocking bug. the trick will work, often for hours or days at a time, but will always result in a GSoD sooner or later.