Correction, it is a 4690K.
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The stock fan heatsink will do just fine for your processor model. Did you run Prime95 with stock thermal paste? Did you get different temperature readings with stock thermal material?
If you need to order Intel thermal material, you can use our Web Ticketing system to do that.
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Check the following URL for some tips to prevent overheating: Processors — How Do I Know if My Computer is Overheating?
I did not take any measurements with the stock thermal paste. Within a few minutes, Prime95 took my CPU to 74C, which is above the recommend limit for Tcase so I shut the test off. Does this mean that the processor is defective?
It does not exactly mean the processor is defective. It might be BIOS temperature readings or even the artic silver paste that is why I mentioned about requesting new Thermal Interface Material (TIM) from Intel.