Overclocking
In our Radeon HD 4770 launch coverage, we relied on ATI’s Catalyst Control Center for overclocking. The Overdrive routine, however, was limited to pretty paltry settings. We took the default 750/800 MHz clocks up to 830/850 MHz. And that was only on a single board.
But using a modified version of RivaTuner (originally showcased in Xbit's 4770 story), we were able to independently tune each of our Radeon HD 4770s up to 850/940 MHz and run stably in CrossFire mode (individually we got the second sample up to 870 MHz without stability issues).
The benefit attributable to overclocking increases according to resolution, which makes sense given the more demanding graphics load. By the time you hit 1920x1200, you’re looking at a roughly 10% gain sans AA, and an even more significant boost with it, though only 1280x1024 is really a playable option at that point. At 1680x1050, with 4xAA, you’re looking at a greater-than 20% boost—nothing short of incredible.
