We’ve already discussed how incredible a deal the HD4770 currently is for it’s price.  Legit Reviews wants to show you how to make it even better with this overclocking guide.  Using only RivaTuner, no voltage mods and no changes to the cooling they were able to hit 931MHz core and 1000MHz GDDR5, which pushes it above the HD4970 in terms of raw speed, though not in terms of total power.  A little modding of the power and cooling and you may see even higher frequencies.

“The ATI Radeon HD 4770 512MB video card is no slouch when it comes to overclocking performance, but the trick is that you will need to use RivaTuner in order to get great overclocks as Catalyst Control Center really limits how high you can reach. The 931MHz overclock that we were able to reach was only stable for 3DMark Vantage overclocking, but the 915MHz clock frequency was 100% stable for all games and benchmarks. We are happy with the overclock as 915MHz/1000MHz sure sounds and performs better than the default clocks of 750MHz/800MHz. The only thing really holding back the ATI Radeon HD 4770 is the number of stream processors and texture units…”

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