MSI 6970 Lightning-Bouncing GPU Core clock in GPU-Z under load

Hi,
When doing some stress testing with furmark, I noticed the GPU Core Clock would bounce around between 600mhz-940mhz under 99% GPU Load.  Is this normal??  I figured it would hold steady at 940mhz under load,not really sure why it's bouncing around.
Thanks!

Figured it out.. had to change the Power Control settings in CCC to +20%... maintains 940MHZ now

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    Uploaded with ImageShack.us
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