Viperlair posted a review on the Thermalright XP-90C Heatsink

Three or four degrees difference over the Zalman cooler may not seem like much, but to an enthusiast that may mean the difference in a decent overclock and a great overclock. Naturally when compared to the stock cooler on the 3.4 there is no surprise in the huge temperature difference, but it does give a great example of how much more efficient the XP-90 is.

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