Overclocking the 2600 and 2400
For our next set of performance metrics, we spent some time overclocking the Radeon HD 2600 XT, 2600 Pro, and 2400 XT using the clock frequency sliders available within ATI's Catalyst drivers, under the "Overdrive" menu.
To find each card's peak core and memory frequencies, we used the automated utility built-into Overdrive and then tried to raise the GPU and memory frequencies further until our test system was no longer stable.
When all was said and done, we were able to take the Radeon HD 2600 XT up from its stock GPU and memory speeds of 800MHz and 1100MHz, respectively, to 855MHz and 1175MHz. The 2600 Pro was able to hit a GPU speed of 660MHz and a memory speed of 550MHz, and the 2400 XT peaked at 700MHz for the GPU and 900MHz for the memory.
While each card was overclocked, we re-ran a couple of high-resolution benchmarks and saw marginal gains of about 0% to 9%.