http://ati.amd.com/products/radeonhd3600/specs.html

"ATI PowerPlay™
Advanced power management technology for optimal performance and power savings
Performance-on-Demand
Constantly monitors GPU activity, dynamically adjusting clocks and voltage based on user scenario
Clock and memory speed throttling
Voltage switching
Dynamic clock gating
Central thermal management – on-chip sensor monitors GPU temperature and triggers thermal actions as required "

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