what is haswell refresh?
compatibility
Not entirely right. While they will work on Z87 boards, they will work ONLY if the bios is updated to a new enough version. It's a safe assumption that haswell-refresh will not work with Z87 out of the box.
-snip-
Haswell Refresh is a re-launch of the Haswell CPU's due to an issue discovered when actually using it. The TIM, Thermal Interface Material, was changed in such a way that heat transfer from the CPU die to the Integrated heat spreader was inhibited by a large amount. This caused very high temperatures on high loads even with great CPU coolers such as the Noctua NH-D15, Corsair H100i or even custom loops. Haswell-Refresh set this straight.
This opportunity was also used to refine the CPU making process, slightly increasing consistency and increasing overall quality, meaning higher overclocks on average and higher stock speeds (As seen that between the 4770k and 4790k there is a 0.5GHz difference). I do believe this opportunity was also used to add a few extras but don't quote me on that.
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