As much as you would love for me to do all the research for you, I won't. However here's two professional sites demonstrating the problem and that's good enough for me.
http://www.anandtech.com/weblog/showpost.aspx?i=657
http://www.legionhardware.com/document.php?id=868
I have no idea what you're talking about with a 4GHz i7. This discussion is about the Radeon 5970.
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