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Different clock depending on programs

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Apr 14, 2012
Bitter cold Sweden
I guess this question has been up before several times.
I've learned that you should always trust MSI Afterburner and GPU-Z when it comes to clock speed. Well, GPU-Z and Unigine Heaven Benchmark shows the same clock speed, but MSI Afterburner and Aida64 tell another story, almost 200MHz less then the others.
So which one can i trust? And why?

Never had this problem with my AMD cards, so it's kinda new to me.