It took me a while to track this video down, but the long search was worth it. Back in 2005, which is 5 years and countless HW generations ago, ATI held the very first global overclocking meeting. World-class overclockers such as Oppainter, K|ngp|n (yes, even back then!) and Macci were running ATI's latest X850XT 512MB live at the Texas Gaming Festival in Dallas. Lucky for us, even back then it was customary to make a video of the gathering.
For more information on the event: http://www.anandtech.com/show/1641