If you can fit all 125mm (5 inches) in, the CNPS9500 LED will certainly satisfy you.  X-Bit Labs has the numbers to show just how well this thing cools.
“We would like to introduce to you a real masterpiece of the air cooling art designed by Zalman. This new baby, which was first showcased at the Computex 2005 has now reached our lab and simply impressed us with its cooling potential. We couldn’t wait to share the results of our first look at this solution.”

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