Published in Graphics

HD 4770 has great OC potential

by on29 April 2009

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GPU at 900MHz without raising voltage

ATI's 40nm HD 4770 appears to be a great overclocker, at least if you do not stick to ATI's overclocking limits. Rivatuner's cfg file can be modified in order to bypass the overclocking limit which easily enables the reference card to go as high as 900MHz for the core, without raising the voltage.

ATI's CCC limits the card to 830/850MHz for core/memory clock and according to our own review and bunch of other reviews on the net, ATI's HD 4770 easily copes with it, even with, what AMD likes to call, a US $99 price cooler.

When bypassed, by simply changing the rivatuner.cfg line RV770 = 9440h-9443h,944Ch and adding "94B3h", it is capable of working at 900/1100MHz clocks, and it was stable enough to complete the 3DMark Vantage. We had high hopes for the HD 4890 and that it could go over 1GHz and by the looks of things, HD 4770 might have no problem with it.

In spite of AMD's non-OC attitude, Asus made a bold press release yesterday where its HD 4770 TOP edition can be pushed to 971/4600MHz thanks to the voltage boost from 0.95V to 1.2V.

Once AMD gets better yields and gives its partners the green light for factory overclocked cards, the HD 4770 card might evolve into something different, a mean beast that can bite hard, harder than expected.

You can find the rivatuner.cfg line and overclocking scores over at Expreview.com.

Last modified on 29 April 2009
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