Yes, that thread needs to go (iow, it needs to be unstickied). It's 45 pages long, a giant mess of information with no organization, and the very first post has more factual errors than facts. I pointed this out in post #670 of that thread over 2.5 years ago:
I've seen post 1. It frightens me, frankly. I mentioned to you a while ago that checking for direct rendering via glxinfo will not indicate if 3D acceleration is enabled any more. You argued with me about that point for a while and your first post still says to check the direct rendering status. The ATI section is completely out-of-date, despite the fact that you have been given correct information for Slackware 13.0. There are numerous references to the 'i810' driver, though no such driver actually exists for Slackware 13.0.
Whether it's replaced with another sticky thread, or the information is collected on SlackWiki is something I really don't have an opinion on as long as the thread is no longer the first thing people see when they come to this forum wondering about 3D acceleration on Slackware.