Sadly so, it is recommended that you re-apply AS2 after 3 months. If you monitor your temps you may also notice that your temps raise.
The Volcano 7 is a pretty good hsf combo. It has a variable speed fan on the heatsink. IT monitors the temps, and at 25C it runs slower then it would at 35C. Although some have questioned the actual ratings of the fans, it's pretty decent.
BUT, the Alpha is a better comobo, with teh YStech or hte Panaflo. IT is simply one of the best heatsink sout right now.
-Jokerf15