更正....真的是看錯了XD
轉一下8.3 release note:

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Hybrid™ Graphics Support

This release of Catalyst™ introduces Hybrid™ Graphics support. Hybrid™ Graphics delivers a significant 3D performance boost for systems featuring an AMD 780G integrated graphics motherboard and an ATI Radeon™ HD 3400 series graphics accelerator.

Users can simply disable Hybrid™ Graphics to run in power saving mode (the ATI Radeon™ HD 3400 series features PowerPlay™ technology, which reduces power usage during low GPU activity). This feature provides support for up to four independent displays
Note: Hybrid™ Graphics is only supported under the Windows Vista operating system
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這也就是說把在Vista下把Hybrid™ Graphics選項disable掉就打開Powerplay的功能了?誰試一下?