Yeah, I have had good sucess with the silencer, about a 20c+ drop in load temps. However, it depends what your temps already are to know if its woth it. The Ultra's typically have very good stock cooling, so if your temps are already OK, it might not be worth it.
BE HEARD - Techonvent
DS3 | E6400 - 3.2GHz 24/7 | 2GB OCZ PLat. PC6400 | 6800GT | Zippy 460W
What the world needs is more geniuses with humility, there are so few of us left.