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The processor itself is 5* but Intel's execution is poor.
on 6 February 2014
Now don't get me wrong. The processor itself is as promised and works amazingly. The packaging was military grade and got delivered to me in an acceptable period of time. My problem with the processor is with its overclocking capability. If for some reason you've bought a K-series processor and don't want to overclock then this is a 5* product.
Intel, for some reason, decided to use a cheap thermal paste between the Internal Heat Spreader (metal plate on the actual processor) and CPU die rather than soldering it like they used to in their previous generations of processors. Normally I wouldn't complain about this but seeing as how this is a K series processor with overclocking in mind this defect is not acceptable. People have removed the IHS and replaced the internal thermal paste with a mercury based paste instead and have seen temperature drops in the ranges of 10 to 20 degrees Celsius. Even if you don't overclock, if you were to play a CPU demanding game with the stock cooler, some people have reached 90 degrees Celsius which is on the border of affecting your CPU's longevity.
For those of you who do want to overclock I'd suggest a high end cooler. I have a NH-D14 which at idle keeps my processor around 30 degrees in BIOS, 26 degrees in Desktop (HW Monitor) and can go upto 74 ish degrees when stress testing in prime95. If you want to overclock without affecting your temperature then increase the clock rate but do not touch the voltage since that's what affects the temperatures. This is what I'll be doing since I don't want my temperatures too high. Which again wouldn't be as much of a problem is Intel didn't cheap out.