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Just by itself CoreAVC will make a difference, because it's faster than libavcodec.
But since you have a GeForce graphics card, make sure you select "Prefer CUDA acceleration" in CoreAVC's control panel. It should then decode h.264 with the graphics card instead of your processor.
At that point, the only thing the processor should be doing is rendering your subtitles. Your CPU usage should be in the 20-25% range.
CoreAVC does not come with CCCP, because it's not free. You can purchase it from corecodec.com for $15.
Edit: The 8x series of GeForce cards should work with CUDA, according to nVidia. Try updating to the newest reference drivers from nvidia.com.
If CUDA or DXVA isn't working, then your graphics card is not being used to decode the video. Your graphics card and the AGP4x bus isn't even entering into the equation unless you enable hardware acceleration through one of the two aforementioned methods.
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