FPS not increasion {QUESTION}

Hi,
I changed my in-game CF settings to the lowest options and changed my Windows 7 64 bit. to the best performance settings too. Everyone told me that like this I would get around 25-50 FPS +, I also did a defrag. of my computer and cleaned it up but my fps didn't change, they kept the same.
Does it mean my graphics card is on its' max power and I can not have better fps?

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