Yeah, I ahve heard of this. Just one of the many tweaks some people do just to get those few extra points in 3Dmark. Hmm this is making me want to see if I can beat my best score of 8019.
EDIT: Wooo just went and tried it and upped my score by almost 100points. Although when I got 8019 I was still using my 3700+ and it was only at 2.6ghz. Still that's a nice increase