Integrated GPU performing better than Dedicated GPU

My HP dv6t quad edition laptop has switchable graphics, and is supposed to switch from the integrated to the dedicated gpu when the application requires more power, but it doesnt for whatever reason. So what I did was go into the BIOS and change it so the dedicated gpu is the only one active. I use it to play games like Battlefield 3 and Skyrim. Skyrim struggles on low (as expected) with the integrated, and can work on high (Skyrim's autodetect). But what confounds me is that BF3 runs smoother when using my integrated card vs my dedicated card. What gives?
My specs: Windows 7 Home Premium, Intel i7 2630QM (2.0GHz - 2.9GHz), 6GB RAM, 720GB 7200rpm HD, Radeon HD 6770M GPU
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  1. Download GPU-z and check which card is actually working when playing BF3.
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