Good advise in the previous posts, mine is to stay away from the coolermaster I've got one sitting right here and it does not perform like advertised, its been a waste of money as far as I'm concerned, just got my Swiftech today to replace it with, this will be my second Swiftech I've purchased, first is on another machine running fine, no complaints, FYI, the Swiftech outperforms the Coolermaster by 10c, thats a big difference, I've bought all my heatsinks from <A HREF="http://www.inflowdirect.com" target="_new">http://www.inflowdirect.com</A> they've been great to do business with.
Details, Details, Its all in the Details, If you need help, Don't leave out the Details.