Maybe you missed the temperature testing results...
http://www.short-media.com/review.php?r=280&p=3 (bottom of the page)
55*C under load with a stock 4000+ is wholly unacceptable for a heatsink that's intended for overclocking.
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-MCCCXXXVII
"
Ignorance is forgivable. Stupidity is inexcusable."
Resident Dual CPU Addict: 3 working duallies, 2 more in the parts drawer, and looking to add an Opteron dually to that list as soon as I can find a good motherboard...