Increase in the price of a little a better thermal paste is not justified .Certainly will be better to cool the processor without top cover first tests showed no noteworthy improvement and unlock a multiplier is no longer cost . Since it is K model is not that worth mentioning. 3D tranzistors but did not show progress .
lack of competition allows behave more like a pig with puppies .
Without the protective cover will definitely be colder .I think I'll wait for Broadwell.
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With better pin material and some work transfered to z97, those new Haswell will definitely clock better than your nake chip. However, I second that intel should have done it in the first release of Haswell