Just adding my name to the list of people with this issue. My cooler however is a Swiftech H240-X AIO water-cooler, which to be honest shouldn't have any issue cooling this processor. Without load, the processor stays at ambient as you'd expect. The In-Place Large FFTs and Blend in Prime95 run about 40 degrees above ambient (70 degrees) while using the Small FFT results in instant >100 temperatures and the computer will eventually restart. I had read recently that someone had de-TIMed their 4790K and found cooling afterwards substantially better, which supports the idea that there's terrible heat conductivity between the top of the die and heat-spreader.
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