"The simple fact is that going from a stock cooler to either of these
replacements from Thermaltake or Thermalright is going to be a great move.
Each option has its strength and weakness; the Thermalright HR-03 GT takes
up more valuable case space and doesn't come with a fan for those that want
to use active cooling (which I recommend). It does however provide the
option for passive cooling and also presented the best cooling results once
we did put a fan on it."
FULL STORY @ PCPER (http://www.pcper.com/article.php?aid=493)