Supported configuration for OpenCL GPU acceleration in Premiere Pro CS6 is exactly and only this:
"GPU processing (Mercury Playback Engine GPU Acceleration) extended to use OpenCL on some systems: AMD Radeon HD 6750M and AMD Radeon HD 6770M graphics card with 1GB VRAM in MacBook Pro computers running Mac OSX v10.7"
That's from
this page about what's new in Premiere Pro CS6.
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Todd Kopriva, Adobe Systems Incorporated
product manager, professional video software
After Effects team blog
Premiere Pro team blog
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