Radeon HD4890 doesn't clock past 500 MhZ (core only)

I figured my setup should pull this no problem - I got 36 amps on the 12v rails. When I use ATI's AutoTune feature on my card, I can't set the clock past 500 Mhz - it doesn't change no matter what I specify. I'm talking about the "Current Values" panel. Any idea?

Thanks...
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More about radeon hd4890 doesn clock past core only
  1. current values is your current clock... which is throttled down to save power... if you run a stress test and watch the clock at the same time... you will notice then number jump up
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