Re: how/should I overclock my video card ?
Download and run ATI Tool and follow these steps. Find your max Core and memory clocks and then lower it by 10MHz, to be safe. Remember to run Artifact Scan to see if there is any problem. If there are artifacts, then lower it by 5-10MHz, until it becomes stable, and you see no artifacts, at all.
You would see a change in speed once you overclock your VGA. Your FPS would be higher then stock performance and it'll work better. Overclocking just helps your components run at a better performance then it is when you first buy it.