Neoseeker take a look at Sapphire's RADEON X800 XL, ATI's direct response to the very popular 6800GT.

One of the nice features about the Sapphire overclocking utility is the find the maximum function. Click a button and the utility will run tests at each clock increment for a user specified time. If no errors are detected at that clockspeed, the next clock stepping is used. This is a pretty slick process and seems more accurate than the process used by the NVIDIA drivers - attempts to move the clock and memory speed above the detected failure rate would result in crashes and artifacts.

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