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That is about what credible results I've seen myself. Which is why if I had a kickass PC, I'd water cool it.
*Shrug*
OK - it's your dime, spend it on what you want.
But air cooling has come a LOOOONG way since the introduction of heat pipe technology. This review shows the results of various coolers tested the same way, unlike most reviews of cooling products which concentrate on either water or air but not both, meaning you can't quite so easily compare the two.
http://www.tomshardware.com/reviews/cpu-cooler-charts,1967-9.htmlNote that at 100% load and high fan speed, 2 air coolers performed better than the best water cooled solution (MSI Hydrogen) and
3 better than the Zalman Reserator XT. Also note that among the best, the delta was a few degrees at most.
Other than pointing to reviews like this one - I don't know what else to say. At one time, a serious system meant watercooling, Pelzier, or phase-change cooling. But a Zalman will set you back about $450, while a top of the line air cooler will set you back about $80. That's $370 to spend on a lot of goodies that are going to be a lot more useful than a degree or two of cooling one way or the other. At least in my opinion at any rate.
My gaming system is watercooled - but that is because I already owned the water cooling components other than the CPU block for the new CPU, and the motherboard I bought had a watercooling/air hybrid block on the chipset.
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