ATI Radeon HD 4770 512MB Video Card ReviewTue, Apr 28, 2009 - 12:00 AM
Radeon HD 4770 Overclocking
To overclock the AMD Radeon HD 4770 graphics card, I used the ATI Overdrive utility that is part of the CATALYST Control Center. When you ‘unlock’ the ATI Overdrive, you can manually set the clock and memory settings or let the ‘auto-tune’ utility set the frequencies for you. Just for fun, I tried out the auto-tune feature to see if it could really find a stable clock configuration, and it worked in just a few minutes and did not lock up the system. This utility determines the highest core and memory clock frequency that is stable and shows you what the GPU temperature is and how much load the GPU is under during testing. I started out at the default settings of 750MHz on the core and 800MHz on the memory, but was able to reach higher after spending some time overclocking the card.
When all was said and done I was able to reach was able to reach 830MHz on the core and 850MHz on the memory. This is an 80MHz overclock on the core and a 50MHz boost on the GDDR5 memory ICs.
To test out the overclock I fired up 3DMark Vantage again and this time got a score of X3351, which is an improvement of 8% over the default score of X3083!
In case you forgot what the stock score was I tossed the overclocked numbers into the performance chart with the other cards to give you an idea on how it stacks up to the competition with the overclock.