I was a SC2 beta tester and use 196.75 hours from its release. I used it to run SC2 and leave it on the menu screen for hours. Was the house on fire when I come back? No. Was the room on fire? No. Was the computer on fire? No. Was the video card on fire? No. Was there a BSoD? No. Was there a crash? No. Was there a performance gain with that driver? Yes. Was there anything wrong? No. Did I repeat this test? Yes, many many times.
Please get the facts straight. Video cards were being killed before and after 196.75 by the menu screen. Somehow the video card was rendering the manu screen in a crazy speed as CPU is not in the way. Many were joking in the beta forum about it being a better GPU stresser then furmark. 196.75 was release for only 2 days and was quickly withdrawn at March 2010 as some tester found that their fan doesn't spin up when it should with that driver. As usual conflicting reports by varies testers saying different things as well as 1-2 claims about a fried video card. What beta testers said within the forum is one thing, what ended up into media is another. At the time of release, many more people have their video cards fried by the menu screens at July 2010.
Beta testers screamed as loud as we could about the menu screen, but all that was heard was 196.75.
http://us.battle.net/sc2/en/forum/topic/248426046
4870x2 killed without CF enabled.
At the same time, 480 was out and I was waiting to see 480 being killed by SC2. Unfortunately, it did not happen, even though forums were filled with reports saying 480 runs too hot blah blah blah.
What are myths and what are facts? Your call.